This is an old trick my Dad taught me, though I'm sure many of you have done this before. It will make your bike make a sound like a motorcycle when you go, and the faster you go, the louder it gets!
Stuff you'll need:
A piece of plastic, like an ice cream bucket lid.
Tape, duct tape works best, remember, this is on your bike so it will be outside.
A bike, of course.
Could someone make a video with the sound of this thing? I would make one myself but I'm on dial-up so I can't upload video.
Step 1: Make the Flapper
Get the piece of plastic, and cut out a piece about four inches long by one inch wide. You can make multiple ones too, it might make it louder (I've never used more than one at once though).
Step 2: Attach Flapper to Bike
There's a bunch of pictures for this step, look at them for detailed instructions on taping down the piece of plastic.
I made a mistake when doing this. Make sure the piece of plastic is pointing much more downwards, not up like it is in the pictures. Otherwise it will make a really gay high pitched sound because it is snapping back too much and hitting the spokes.