Wouldn't it be wicked if you're laser pointer was water proof it would make an awesome laser stretching across a pool.
You need a laser pointer, a stove, some cling wrap.
Step 1: Wrap Up
take the cling wrap and get a half fot by a half foot square.
Step 2: Wrap It Pt.2
put it in the middle and fold the ends in and try and keep one layer of wrap on the part wwhere the laser comes out.
Step 4: Singe It Up!
put the laser over a low flame to where there is little heat to sorta melt it and tighten it up but keep it away from the laser head so it doesnt burn through.
Step 5: Wala...whala..wa...youre Done.
I have done this several times for cool swimin fun and if you wrapped it tight enough it will work perfectly!