Detaching MailChimp's Arm

Looks like someone discovered a little tiny hidden UI "easter egg" in MailChimp. Ah, the dismembered monkey. We get occasional phone calls from new customers right when they discover this trick. We pick up the phone, and hear giggling, and then they say, "I just ripped out your monkey's arm! Bye!"

Funny thing is, our web/UI designers never did this---it was our programmers that worked it in one late night. We call that kinda stuff "monkey love" around here. No telling how many other hidden monkeys they've worked into the UI.  I'm almost too scared to ask.