The birds treat my backyard - including birdbaths, feeders, vegie patch - like a giant playground. Their antics amuse me to no end, even at the expense of my tomato crop. I think the best laugh is when parrots bathe: fluff, flap flap, splash, dunk head, scare other bird away, flap, hop, shake, ruffle, fly, shake, fluff, waddle waddle (whilst looking a bit of a drowned rat).
Speaking of which, rats are themselves occasionally using my ceiling cavity as a playground. This sometimes wakes me from my slumber, and hence is far less amusing.