My zipper
 

My zipper on my pants keeps going down on it's own. HELP!

Are you SURE it does that on 'it's own' ;)
Maybe you should get rid of the pants because it's too small.
Although I used to have it with a pants too. What I did was I always made sure I pulled it up all the way and pushed the lid down so it's on the zipper, this will kinda stop it going down while it stays. And check the zipper regularly.

use a safety pin, on second thought get a bigger size pants.

HAHA!! Man, thats sooo funny because I have a pair of pants that do the same thing. Usually if I just yank the zipper up high enough it will sorta jam in the upright positon. :) If that won't work, just wear an extra long shirt... that way when the zipper goes, at least no one will notice.

I hear letting your dong flop out the front of your pants is in style this season, so I wouldn't worry about it.

While choosing Antagony's method may be the latest in style, you should always take precautions to ensure no damage occurs to your equipment.

Keep in mind that this will leave your gear exposed to the elements, so be sure to have rain gear on hand for cloudy days. In the summertime, you will want to make use of a sun blocker with a minimum SPF 15 rating. During the cooler months, you may want to try using a small sock (or large sock depending on the dimensional requirements) to keep warm.

Be sure to exercise additional caution while around moving machinery or sharp objects.

You are all very smart people.

Ashton's on the right track, just make sure you have good welding glass.