Pretty much everything Tim Gunn does is a CMOA, but his recent lecture about Gretchen in Season 8 pretty much tops them all.
Tim Gunn: I have a few words for Team Luxe. I fundamentally do not understand your behavior and demeanor and affect on the runway. I don't get it. I donít know why you allow Gretchen to manipulate, control and bully you. I donít understand it.
To put it in perspective, this speech occurred after Gretchen had stabbed her team in the back during judging*
(she heap praises on her teammates' work before completely reversing her opinion and proclaiming everyone else's work to be "terrible")
and then cowed them into turning each other, with no admonishment from either Nina or Michael. It took Tim (usually the most staid and professional of the "experts") losing his temper for someone to finally say what every viewer is undoubtedly thinking.
In that same episode, as the feuding Team Luxe designers all try to pin their failures on Michael Costello and his alleged difficulties with construction, they point out the stitching in one of his pieces as an example, but guest judge Georgina Chapman looks at it and simply says, "Perfect".
Clever editing in Episode 11 of the same season, when Ivy came back and began harassing Michael, accusing him of cheating, and warning him about Karma. Cut to a shot of her nearly getting hit in the eye by a flying needle.
Michael C. smiling from ear to ear in the background while it happens counts as this too.
Also from the same episode as above — Tim Gunn confronting the allegations Ivy made about Michael C.'s so-called "cheating" and declaring the whole thing a "non-issue". Amen, Tim.
In Season 9 Anya lost her money envelope in Mood, and as result was only able to buy $11 worth of fabric with leftover money that Anthony Ryan gave her, and had to make the rest out of muslin (they did go back to get $50 worth of fabric for another garment, which she did not lose, but she still only had about a third of what everyone else did). The "Awesome" comes in when despite all this, she won the challenge!
On an All-Stars challenge, the designers had to talk random people on the street into giving up their clothes to be used as fabrics in the design. Anthony Williams talked a man into giving up his shorts, leaving a very attractive brief-clad gentleman in the middle of the park. Cue the following:
Austin Scarlett: I don't know about Anthony and him, but I got the guy's phone number.
The look of "Oh Crap" on Kennley's face when she realizes Tim Gunn is going to be one of the judges for the finale, after she's disrespected him that whole season. Yeah...it was so awesome!
Season 10's Dmitry Sholokhov finally winning episode 9 after being snubbed repeatedly. His reaction when the other designers ask? "About fucking time!"
In Season 11, Richard has a great Make It Work moment when, after having put off putting a lining on his dress, he improvises and uses the t-shirt he bought at Mood earlier in the episode as an improvised lining. The awesome is that he actually wins the challenge.