probably act 4. I feel like act 4 is when the comic starts to really find its identity. it's kind of the perfect middle ground of the early act bullshit and the later act different-kind-of-bullshit. also, Descend is up there for my favorite act-ending flashes. WV: Ascend is my all time favorite flash, so Descend never really had a shot at #1 for those, but it's really fucking good.