Two blondes decided to split a can of Diet Coke.

One blonde opened the can and poured half of it into her own glass, and a half into her friend’s glass.

Before tossing the can, she stopped to read the nutritional information on the side.

“‘Only one calorie per can’,” she read aloud.

“Hmm,” murmured the other blonde, “I wonder which glass has the calorie?”