- Whenever Tom and Jerry team up against a greater foe typically qualifies as a CMOA, because when they do, said foe is in for a vicious defeat; there are several sterling examples of why it's not a good idea to piss both Tom and Jerry off.
- In 1942's "Dog Trouble", a proto-version of Spike alternates between terrorising Tom and Jerry until they end up in the same safe haven atop a cuckoo clock. Jerry spots a basket of knitting yarn, and while Tom distracts Spike, he winds the yarn around every piece of furniture and breakable item in the living room. After doing so, he provokes Spike into running headlong into the tangled web, demolishing every last thing in said room. After seeing the resulting sight to behold◊, an irate Mammy Two-Shoes throws an indignant Spike back onto the porch.
- In 1952's "Triplet Trouble", after the eponymous feline hellions have wrought havoc on both of them (while presenting angelic exteriors to Mammy Two-Shoes), Tom and Jerry exact revenge in style. Jerry first provokes the kittens by drinking their purloined cream and spitting it back in their faces, then leads them straight to Tom, perched on a hostess trolley... on which he takes to the air like a bomber pilot, hurling pies and watermelons at the kittens before scooping them up and dropping them onto a spinning clothesline. Jerry spanks each kitten with a carpet beater while Tom ties paper wings to their backs, so that when Mammy returns with a bottle of cream, she finds the "little angels" still spinning on the clothesline, each sporting a bright red backside. The set-up is great as each has gotten laughs seeing the other being tormented by the trio until they're on the receiving end. It comes to a terrific shot of the two thrown out a window, glaring inside and then sharing a look. You can see them both thinking "I don't like you, you don't like me, but we both hate those punks even more, so..."
- This seems to happen a lot in the made-for-video movies, but the greatest example is "Tom and Jerry Meet the Wizard of Oz". Early in the film, Miss Gulch takes Toto away from Dorothy while Tom and Jerry were incredibly saddened by the sight of this, and what do they do about it... they fixed a makeshift bike and went after Miss Gulch and managed to save Toto. Then as the film progresses, the two try to protect Dorothy from the Wicked Witch of the West and manage to get the very bucket of water that melts her.
- It doesn't just have to be when they team up to defeat an enemy, either. Any time they team up counts as a CMOA or a CMOH. In 1958's "Tot Watchers", Tom and Jerry work together to bring a baby safely home (because the Dumb Blonde babysitter is too busy chatting on the phone to notice the baby wandering straight into various dangerous situations).
- It can also be particularly gratifying when Tom wins on occasion. When he does win, it tends to be because he really deserved to (but once or twice, it's just letting the villain win).
- In 1944's "The Million Dollar Cat", Tom inherits a vast amount of money, but the inheritance comes with a clause that he will lose all the money if he ever harms a single animal, "Even a mouse". Jerry decides to be a complete prick about this: stealing Tom's money, eating the extravagant food right off of Tom's plate, and even causing grievous bodily harm to the poor housecat, all because he knows Tom can't retaliate. Eventually Tom snaps and, after tearing up the contract and stuffing it into Jerry's mouth, proceeds to beat the crap out of the little rodent, because there are some things more important than money... like the happiness you gain from taking revenge on the little bastard that made your life miserable.Tom: Gee, I'm throwin' away a million dollars... BUT I'M HAPPY! YAA-HOOO!
- In the 1953 short "Mouse for Sale", after Jerry charms Tom's owner, Joan, as "Jerry the Dancing Mouse" despite Tom's repeated attempts to prove that Jerry is not the rare white mouse Joan believes, Tom turns the tables on Jerry by painting himself white and winning Joan over as "Tom the Dancing Cat", ending the cartoon with a performance that involves repeatedly stomping on Jerry.
- In "Timid Tabby" from 1957, Tom and his cousin, George, get revenge for Jerry tormenting the intensely mouse-phobic George by teaming up to drive him to believe he's gone mad, sending him running to a house for mice who've had nervous breakdowns. (As a bonus, George's fear of mice is cured.)
- In 1958's "The Vanishing Duck", Jerry and Quacker use vanishing cream to literally turn themselves invisible and just be dicks with Tom. Tom discovers the cream himself and decides to employ some Laser-Guided Karma.
- From 1965, "The Year of the Mouse". If you make a poor cat believe that he's trying to kill himself while sleeping, then ending up trapped in a bottle, with its cap tied to a gun's trigger, is pretty much what you deserve.
- The Chuck Jones-era "Love Me, Love My Mouse" from 1966, in which, after Tom has to deal constantly with getting framed for mischief after Jerry pretends to be helpless in front of Toots, Toots's feline instincts awaken upon kissing Jerry tenderly, much to the latter's sheer chagrin. Even Tom, despite even being on bandages and plasters, cheers for his girlfriend and watches as Toots chases after Jerry out into the sunset. Bonus points for the subversion of how in some particular shorts from Hanna-Barbera-era, Jerry gets to usually kiss or woo the main girl Tom (along his rivals) was going after, without such logic applied.
- In 1944's "The Million Dollar Cat", Tom inherits a vast amount of money, but the inheritance comes with a clause that he will lose all the money if he ever harms a single animal, "Even a mouse". Jerry decides to be a complete prick about this: stealing Tom's money, eating the extravagant food right off of Tom's plate, and even causing grievous bodily harm to the poor housecat, all because he knows Tom can't retaliate. Eventually Tom snaps and, after tearing up the contract and stuffing it into Jerry's mouth, proceeds to beat the crap out of the little rodent, because there are some things more important than money... like the happiness you gain from taking revenge on the little bastard that made your life miserable.
- The sequence when Tom invites his cat buddies to party hard in Saturday Evening Puss can be this, what with jazzy music and pretty imaginative, hilarious animation. Watching also how Tom and his cat gang are having a pretty darn good time can add to that too.
- The canary saving Jerry from being run over by Tom in "Kitty Foiled".
- In "Professor Tom", when Tom starts spanking his student for letting Jerry get away, Jerry responds to this by breaking Tom's tailbone.
- In something of a role reversal episode, "The Little School Mouse" has Jerry trying to teach Nibbles how to outsmart Tom, who sees through him and defeats him each time. Nibbles tries merely politely asking for Tom to assist in tasks, and succeeds.
- In "The Milky Waif," Jerry going Papa Wolf on Tom after Tom spanks Nibbles with a fly swatter.
- Tom's performance of "Is You Is Or Is You Ain't My Baby" in "Solid Serenade". Say what you will about his Jerkass tendencies, that cat knows how to play a bass.
- Every time Tom plays musical instruments, especially piano. In "Johann Mouse", Tom learning how to play piano (in six simple steps), and he instantly becomes an accomplished pianist; even the Emperor summoned him to perform at the palace.
- If that wasn't enough, Tom proceeds to play the piano with his toes while trying to catch Jerry. Most musicians would kill to be half as good as Tom.
- Tom's ridiculously, awesomely, overdone introduction to the lady in "Texas Tom". HOWDY.
- In "Hatch Up Your Troubles", Jerry and a baby woodpecker are running from Tom and are cornered. Tom hurls a wooden hoe handle like a spear. The baby woodpecker then shears the hoe down to a nub while it's still in midair.
- Jerry and the baby duck rescuing Tom from drowning in "Just Ducky." Tom has just attempted to eat both of them, but they save his life anyway. Bonus points for the baby duck for conquering his fear of swimming to dive in and rescue Tom.
- In "The Flying Cat", Tom finds himself in the undignified position of hanging from his ankles by a girdle from a second story window. After he picks himself off the ground, he decides to take advantage of it by using the girdle as a wingsuit to fly. And he gets it on his first try, too! (Until he faceplants into the mailbox, anyway.)
Awesome / Tom and Jerry