Birds Pooping Inside of My Purse

Dear Wording Dervish: Somehow a bird managed to poop *inside* my purse. Woe is me. A poem or a limerick might help.

When you're outside having fun, there's nothing worse
Than some bird taking a big poop in your purse
Gloppy dung on my things
It's a sure sign of spring
I hope it foreshadows luck, not some fowl curse