Cool tf idea:
Prank your friend by secretly casting a spell on them that will slowly transform them over the course of their workday, giving them increasingly dysfunctional features such as huge, unusable paws.
Then, tell their coworkers, boss, etc (everyone who will be there) about what you’re doing, and tell them to pretend not to notice that they’re shrinking or growing or gaining fur or whatever. Set it up so they give your friend more responsibilities and tasks and awkward situations as they continue to transform and attempt to hide their changes. Of course, none of these tasks will actually be real or important, but your friend won’t know that until the very end when the bit is finally done.
And then, after that hopefully-relieving-and-not-too-upsetting reveal, everyone can just kinda hang out for the rest of the day! It is a holiday, after all…
… They probably won’t get back at you for this, right?