April Fools!
Having successfully, if mildly, pranked my boss this morning (sorry, Tom!), I realized I didn't know if federal personnel policy includes rules on practical jokes in the workplace. After a little bit of digging, there doesn't seem to be a blanket ban, although the obvious and usual cautions about not resorting to discriminatory humor apply. And after all, unless you're operating on Chris Rock's level, relying on race, gender, sexual orientation, age, or ability for humor is just lazy. We can always get more creative than that.