For example I once took the time in Divine Divinity (On a side note, is Divine Divinity the worst title for a really good game ever? It's got to be up there.) to move several boulders into Lanilor's house in Aleroth while he was outside. Then I ran away giggling... well I was giggling, my character did the running. I then imagined Lanilor walking back into his house...
"Well hot dang, what have we here? Some boulders have gone and done crawled into mah home! Dag nabit! I thought I done told Joram to quit messin' wit dat Animate Boulder spell!"
Since Lanilor wasn't voice acted in the game (at least I don't think he was) I like to imagine him speaking with a southern drawl. Also, yes I am touched in the head.

So anyone else like to do weird and mischievous things in video games just because?