Brewster Hotdog: Lunch Guy!

"I can't decide on a costume." says Cliff.
"Better hurry!" says Lt. Snap. "The Halloween party is tonight!"
Just then Cpt. Rockit arrives wearing a hotdog costume.
"Hey, look!" says Snap. "Brewster's all ready!"
"Ready for what?" asks Rockit.
"The Halloween party tonight!" says Snap.
"Oh, right!" says Rockit. "I'd better go change into my costume!"

It's funny because they thought he was in a Hallowe'en costume, but actually it was a sex thing.

Brewster Rockit: Space Guy!, 2013-10-28.