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[–] stretched_girl 0 points 2 points (+2|-0) ago 

Touching a 9V battery to your tongue will also work, and it's cheaper.

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[–] discoball [S] 0 points 1 point (+1|-0) ago 

Yes but I can't use a 9V battery to wake me up in the morning.

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[–] stretched_girl ago 

That's what alarms on watches and clocks and tablets and phones can do.

So, after breaking your nasty habit, does it really have more utility than the things you already own that can wake you up?