Travis has the highly effective danger bomb alarm clock. To turn the alarm off you have to disable the alarm. Warning: this is VERY loud!
Clocky is probably one of my favorites, it actually rolls off of your nightstand so that you have to chase it down.
Flying alarm clock.
The Flying Alarm Clock wakes you up with a loud shrieking alarm coupled with a little propeller-driven key that leaps off your nightstand. To turn off the horrible racket, you have to get out of bed and retrieve the key.
Or last but not least just have your spouse wake you up. That's what I do do for Travis most mornings.