[Now Finn appreciates a good prank as much as the next guy- but he walked right into that one.

Literally.

His mouth opens in a silent scream before he staggers back, reaching up to try and knock the spider off his face. As soon as he touches it though he realizes it's rubber- and after he peels it from his face he grins up at Marceline.]

Haha, good one Marcy! Fake spider- yaknow you and your brother are gonna hafta teach me how to prank as good as you guys.