Sonic Grenade

If you know someone who doesn't get out of bed very well (like me), then this'll be perfect to awaken them bright and early.

Once the pin leaves the grenade, simply through it in to their room and the Sonic Grenade emits an ear-piecing noise which will surely make them jump out of their skin and out of bed (quite literally!)

The problem now, is that only the person holding the pin can deactivate the noise, so whoever's holding the pin - run for you're life - as your victim is now hungry for you to stop that damn noise!

Great fun at parties too, especially if you're the biggest party-goer there - the one that stays awake all night? Why not make everyone else join you!