Falling through the ceiling taking down a roomful of Russian mob dudes in the process.
"Christ, we're good!" "Yes, we are!"
"It's Rocco!" "We've got to fuck with him!"
Connor, after being handcuffed to a toilet while Murphy is being led away to be executed, proceeds to rip the toilet right out of the floor, then drops it right on the head of Ivan Checkov, the Russian mob dude about to shoot his brother.
Connor then leaps off of a fourth-story balcony to land on the mobster's partner, seriously messing the bad guy up.
Murphy has some badass moments during that scene as well — after Connor gets messed up himself after pulling the above landing stunt, after checking on his brother, he takes the lid of the toilet bowl Connor just smashed Ivan with to the head of his partner until he's dead, relieves both mob dudes of their valuables (including their guns) and puts them in a bag, and then hoists Connor up and carries him out of there.
From All Saints Day: "DING DONG, MOTHERFUCKER! DING DONG!
WHO ORDERED THE WHOOPASS FAJITAS?!
The courtroom execution from the first and the final fire fight in the second. The first may also count as Crazy Awesome.
Although the courtroom execution will always stand out, the Badass Boast given by Connor and Murphy to everybody in the courtroom before the deed is what elevates to nigh-on legendary.
Rocco's dream-sequence pep talk from the second film is simply Made of Win, making him one of the few characters in fiction to achieve a CMoA from beyond the grave. Capped off by Greenly, who had just been killed shortly before.