The one that made me laugh the most was Khaaaaaa Aaaaaaaan gogo Star Trek 2 reference
I've also seen

Nofuks Given
Dafuq Yalookinat
Incredible Hulk (shirtless, greenskinned Roe with purple pants /emoting "is angry")
Thespice Mustflow
Teabag Renegade and Teabag Avenger together
Definitely Acat

I've seen so many others that made me laugh, but I can't think of any of them off the top of my head