Heck, you could use some of the results on the Wand of Wonder results chart...
Howabout...
For 1d12 rounds, Plushie Mini-Cthulhu shows up, chasing 1" tall metal replicas of the party...
http://www.toyvault.com/cthulhu/plush_cthulhu.html
For additional fun, how about some
area effect results:
1) Every spell cast in 100' radius this round is affected by a randomly determined Metamagic feat. If this results in a nonsensical result (say, Split Ray on a Fireball), there is a farting sound that emanates from the caster...and no spell gets cast (but the caster doesn't lose the slot).
2) In a 30' radius, every intelligent being "castles": randomly switches places with one other intelligent being. If there is an odd number of beings, the last one switches places with the cat.
3) All beings within 20' radius of the cat disappear into a pocket dimension in which there is no magic and they are all players in a LARP at the Econo Lodge in Minitowoc, Manitoba. There, they must role play their combat. After the combat, "survivors" re-appear as normal. Losers re-appear as magic-less LARPers who have no idea what is going on.
Econo Lodge Manitowoc, Manitowoc, WI : Reviews and maps - Yahoo! Local
4) In an area of effect that mimics a Meteor Swarm, immense columns of water appear in the biggest open space- up to the limits of the atmosphere if in an open area- channeled from the Elemental Plane of Water. In each pipeline swim the normal inhabitants for that plane...and anyone in their AoE. This effect lasts 1d4 rounds. No damage is done by the water's appearance, though drowning is a possibility.