Dropping Bombs at Others' Houses

[Bradyams]

Hypothetical situation:

You and a few friends are at somebody's house. You just met the owner of the house today. You are all just hanging out, and you need to go to the bathroom. You excuse yourself, and go drop a huge bomb. You flush, and it clogs it up. You frantically search the bathroom for a plunger, and there is nothing. Flushing again is not an option the nasty water is already close to the rim of the toilet, and if you flush again and it doesn't free up it will spill over.

What do you do?