Grab a Screw Ball and deal damage like crazy (at least 100%). Jump twice, and at the peak of your double jump, throw the Screw Ball at your opponent, forcing him/her to go up to his/her death. It's not easy to do, but it works perfectly on stages with platforms (i.e. Hyrule).

I'll try to remember this for next time I play Melee with items. This vaguely reminds me of Falco's double shine.

i never thought of that. since i am still a beginer (on level) on both brawl and melee i still use items most of the time.