"I just choked on a spoonful of cream style corn."
She was all ears until I admitted I hadn't really choked, but I had in fact been eating creamed corn, so at least there's a kernel of truth to this one.
*1. Creamed corn (also known as "cream-style corn") is a type of creamed food made by pulping corn kernels and collecting the milky residue fr-- wait, come back! I swear it's not as gross as it sounds!