Quote:
Originally Posted by andrewsmith
What husky said.
I may do that to the parents garage again.
Invest in a multi pitch mosquito unit that will scare them or make them pass out in pain 
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That assumes they're kids though right? And if that is the case a motion sensor cat deterant alarm will work - my 14 year old daughter winces in pain when she sets the one off in my parent's garden but I can't hear it at all.
I'd vote for door alarms to scare the gits but if you don't have power they will be the more feeble battery jobs.