She picks up a banana, a can of soup, and a loaf of bread.
She then walks up to the cash register to pay.
The cashier looks at her and the items she has and says, "I can tell you're single."

She smiles and responds, "How do you know that?"

He says,

Is the girl your fiancé? Are you marrying her out of pity?

Nope to each of those. But thanks for your contribution.

Don't you hate it when you're reading a sentence and it doesn't end how you testicles.