Yo momma is so ugly, she makes blind children cry.
Yo momma is so ugly, even the tide won't come back in.
Yo momma is so ugly, she'd scare the monster out of Loch Ness.
Yo momma is so ugly, when she got in the tub, the water jumped out.
Yo momma is so ugly when she went into a bank they turned off the security cameras.