The funniest that Ive ever seen is Asuka Kazama's ending in Tekken 5. It goes like this.
Asuka defeats Jinpachi Mishima, who dissolves into dust. Meanwhile, the advanced effects of Devil Jin's transformation disappear (the horns and the wings are gone), leaving a half-transformed Jin. Asuka rushes to Jin and tries to revive him, wondering what she should do. Though she is unaware of it, her touch undoes the final remnants of the Devil Jin transformation, and Jin wakes up in his human state. Alarmed at his unfamiliar surroundings, Jin tries to stand up quickly, tripping over Asuka and landing face-first between her breasts, making them bigger with a "boing" sound effect. Enough time passes for a small rock to roll to the ground before Jin finally sits up. Asuka, embarrassed at first, immediately turns angry and demands for Jin to explain himself. Jin, however, seems to be completely oblivious to the moment and continues to wonder where he is. Believing this to be a front, Asuka angrily punches Jin into a large rock, calling him a pervert as she does this, and then she stomps away angrily, leaving Jin to ask, "What was that all about?" Immediatly after, a rock ironically falls on his head.
Its hella funny
