This Mandometer plate has a scale underneath which measures how fast food is disappearing, and compares it to a pre-set rate of consumption. If you eat too fast, it'll actually tell you to slow down.

As embarrassing as it'd be to actually own this thing, its heart is in the right place: If you slow down your chomping, your body will register as "full" and you'll eat less. I'm not going to buy one—I don't need some uppity robot plate telling me that no human being should eat an entire Chipotle burrito in seven minutes—but I appreciate the effort.