We all play differently. To that end, with 18 different grenade types to play with, i'm curious about your favourites and why. Me personally, i love my bladedancer's sticky grenade, because it is just hilarious to stick onto peoples heads in the crucible and usually nets me a handy postmortem kill :p
EDIT: Loving the stories and responses from you guys!
EDIT 2: guys we're trending!! Thanks for your awesome responses :D
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Tripmine, except when I stick someone/something and they charge, killing me as well.