It's funny, because his atomic powers do not protect him from the nauseating effects of gluttony. It's also funny because his cape is fluttering due to the powerful flatulence the day at the county fair has produced.
It's more likely he's drunk, as evidenced by his inability to put food in his face without smearing it on his cheeks.
I don't know what that evil little mouse in the foreground is pointing at. Can't be Atomic Mouse.I mean, look at him; he cannot be pointing at Atomic Mouse. Possibly he is gesturing at a cake, but why it should be the object of so much risability I've no idea.