Alright, this is what you need:
A black pair of nylons (or a stocking cap, but nylons are much cooler, give an effect)
A black shirt and pants - preferably sweat pants, more on that later
A sock full of quarters (for your neighbor, or for the fine you get by breaking into his garage)
A crowbar, or taser...
Okay, First, apply the nylons to your head, pull down firmly, make a mean face...
Second, put on black clothing, make sure no tags are showing, as it might give away your pants size - making you feel self-conscious while doing your dirty deeds
Third: grab the sock full of quarters, if your a poor college student like I am, use pennies, nobody uses them and the smell bad anyway.
Grab the taser or crowbar, if your using a taser, subtilly convince your neighbor to open your garage up so you can look in, or just as him the truth, if he spouts off a line like "YOU CAN'T HANDLE THE TRUTH" abort, your in way over your head and your about to find out if Roswell is real or not
If your using a crow bar, convince the door to open and take a peek.
In either case, if the result of your troubles is found to be an affirmitive acknowlegement to your existing suspicions, THEN get angry, if it's negitive, say something loud, like "See, I told you Will, they're aren't is no such thing as a midget nun!" And run off in the opposite direction of your house screaming "No midget nuns, no midget nuns"
Alright, this concludes my stupidity
***DISCLAIMER*** I'm an idot and should not be held responsible for anyone carrying out said thingies... Oh, a more subtle way would be to buy Three Day's Grace's new CD and play "I hate everything about you" whenever your neighbor walks outside, it'd be like his theme song... he'd confess to anything if he kept hearing that for a month or two. (Might take awhile, it's a good song - but your neighbors will get the idea, or you'll get a ticket for disturbing the peace)