One of my cute actions was a builder exercising, he was running around with a rock in his arms.
I had two builders (one male, one female) doing this at the same time! They were each holding a boulder and running up and down the path. Plus, they were running, and neither one was a runner.
One funny that just happened: I was cruising the screen looking for feathers and mushrooms when I came upon a mushroom right on the kids' "business" spot. I started to go get a kid to harvest it (despite my reservations about the taste) when I spotted one rounding the corner of the lab so I waited. Well, she waltzed up to the "spot", assumed the position right on top of the mushroom, and the mushroom promptly disappeared!