when u throw a plasma grenade in halo 2, just keep holding down on the L button and the grenade just keeps burning until u let go, great for sticking someone in the back, wait till they get in the base and relese, u can hurt quite a few people with that.
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That could be quite funny: immagine you stick one to a nearby enemy in multi, holding it down in the hope that he moves away giving you the chance to blow him and leave you unscathed. Instead he takes it to you and you end up running for your life being chased by someone with a grenade stuck to them and only you can decide when it blows.