Art Trade - Amusin' and Abusin'

My part of an art trade with [link]. The enigmatic Mailman has opened up a rift in space and time, letting loose some wacky characters from another universe! Oh no! But it seems they've met before judging by the dialouge.

Perspective is a little screwy on Mailman and Wak-Wak, but then again, Mailman is not one to be bound by the laws of physics...