|
Don't do it, and don't try to figure it out on your own. If you don't know what you're doing (which probably involves wiring into the factory horn relay or adding one of your own) then it will likely blow the fuse for the brake light circuit which will not only make the horn trick not work, but your buddy will be driving around without brake lights not knowing anything's wrong. Imagine having to explain that he's laid up in the hospital with a neck brace (or worse yet--dead) because of a dumb prank you played.
I'm a fan of the more subtle psychological stuff. For instance, make up an excuse to borrow his car, then go get a copy of its key. Then every few days while he's at school/work/whatever, do weird little things like move it down 4 or 5 spaces, back it into its spot if he usually parks nose-first, leave the radio tuned to a polka station, etc. After several days of doing this, casually bring up the topic of mental illness and how it distorts your perception/memory, or how you've been reading up on the theory behind "The Matrix" and the "glitches" in our perceived reality that provide evidence that we're living in a matrix. You get the idea.
|