Spiderpup, spiderpup,
Does whatever a spider...might,
Runs around, licks your face,
Scaring folks all over the place.
Look out! Here comes spider pup!*

*cough cough* Ahem. Normally, I'm not a big fan of scare-prank videos, but this mutt in a spider costume is an amazing time-killer and pants-soiler. Now, before you start shouting that this is all fake, I'd like to remind you that the human brain contains within it instincts inherited from previous species, many of which were tiny furry shrew-like mammals that could, indeed, have been eaten by a big hairy spider. So basically, you're already hardwired to be an embarrassing prank victim on the Internet.