The idea behind novelty alarm clocks is pretty simple--make it tough to turn off so the user doesn't go back to sleep. We've written about one that requires you to aim and shoot at a target, another that rises toward the ceiling so you are forced to stand up, and a puzzler that makes you solve a jigsaw.
Here's one that's actually good for your body, the Dumbbell Alarm Clock. Upon activation, this 1.5-pound device requires you to perform 30 upward swings before it will shut up. Rotate between your biceps and triceps each morning and soon, aside from being regularly on time for work, you'll have arms to die for, too. The Dumbbell Alarm Clock is available from Gadgetshop.com for $32.