I swear this would be the best trick to pull on someone after a buck's night. (or new years party) Pull the pin, chuck into the target room, and twenty seconds later, the poor person is awoken by the piercing alarm coming from the grenade. And how do you turn it off? By putting the pin back in.

Not the easiest thing to do when you are just waking up.

Best to warn the other people in the house before using this. We don't need half dressed people running into the street thinking the fire alarm has gone off. (via Crazy About Gadgets)

Do you find it hard to get your partner or the kids up in the morning? Well the Sonic Alarm is the perfect solution to your problem.

Getting that grumbling snuffling bulk out from under the duvet in the morning is a challenge you really shouldn't have to bother yourself with. Especially as the thing that emerges is inevitably grumpy and looks like a hung-over swamp monster. Well the Sonic Alarm makes the whole 'getting them out of bed' exercise a very simple, and indeed amusing, operation. Looking like an old-fashioned comedy hand grenade, the Sonic Alarm will wake pretty well anything up. Simply pull the pin, yell an emphatic "fire in the hole" and lob the grenade into the sleeper's room. After twenty seconds a very annoying noise (there are three volume settings) will blast out from the alarm. That's not all however, what makes this especially great is that to stop the alarm the sleeper has to find you so you can put the pin back in. It's stupid, and brilliant, and will be the bane of every over-sleeper on the planet. Parents are going to love this, though the soon to be rudely awoken might not.