Regular Show, Season 4

Margaret:
[elder voice] Why did you put it in reverse?

Mordecai:
[elder voice] It was the only thing I could think of!

Rigby:
[He looks at his hands, returning to the gang's real age] Guys, look!

Margaret:
We're getting younger!

[But the de-aging doesn't stop, since the bus is still in motion. The gang starts shrinking, turning them younger until they're kids again]

Mordecai:
[younger voice] We gotta get off this bus!

Eileen:
[younger voice] Guys look, an emergency hatch!

[Eileen points at a hatch in the roof]

Mordecai:
[younger voice] Come on, everybody up!

[Rigby opens the hatch. Mordecai lifts everyone on top of the bus, but when Mordecai finally gets out, he notices they all have turned into babies]

Rigby/Margaret/Eileen:
[younger voice] Now what?

Mordecai:
[younger voice] We gotta jump! [The gang holds each other's hands, and then they all jump off of the bus, giggling] We did it! We got off the party bus.

Mordecai/Rigby/Margaret/Eileen:
[younger voice] OHHHHHHHHHHHHHH!

[They all pop out of existence]'