Singing Cockroach
(Alteration)

Range:  0
Components:  S, M
Duration:  12 turns + 1 turn per level
Casting Time:  1 round
Area of Effect:  400 square feet per level
Saving Throw:  Special

The ultimate seige breaker... When the caster casts this spell on a roach, it works its way into the enemies camp. Once in the camp, the roach finds a nice place and starts to sing really bad. All within the camp must make a saving throw versus spell or leave camp and go home. If they make the saving throw, must make another one each turn with a cumulative -1 to the roll. Needless to say, sieges don't last long... I know it's a dumb spell, but it is the funniest thing to use in a siege or large enemy encampment.
The material component for this spell is a seige tower, which is consumed in the casting.

