My two favorite ones so far this year come from one of my cheerleaders. Both happened during tumbling class:
Cheerleader to me: "So you know a smoothie is blended fruit right? Well ketchup is blended fruit, so ketchup is a smoothie."
While conditioning - Me - Do 2 sets of 25 pushups and finish up conditioning. Cheerleader whines - do we have to? Me - You know when you complain I just double the amount, Class groans. Cheerleader. "I'm sorry I am not feeling very pushed up today." Me - CLASS DISMISSED! The whole class was in tears crying laughing at her. She didn't get what she said until her younger sister explained it to her.