The "BBQ Donut" is a round pontoon boat with a grill in the middle, made mobile with a small outboard motor. Tool around a lake while grilling, suggests its manufacturer, enjoying music from its optional soundsystem. I can't imagine spending more than a few minutes in one before I'd go stir crazy.
I do like the idea of a grill on a boat, however, nestled next to a cooler full of lemon and butter. Who wants to eat hot dogs when you've got a fishing pole or spear gun?