Oh, it's not just trolls. If I'm traveling through the plains I'll purposely run by villages and drag the entire village to a tar pit for amusement. In my current mistlands/plains base I have annoying lox constantly trying to get at my chickens, so anything that comes out of the mist get agroed on them. :-)

In the mountains I shake off annoying drake on stone golems, or annoying stone golems on drake. Blackdwarf get the skeleton treatment, or vice-versa.

Sometimes it's easier to just let others do the dirty work!