Grenade fishing gone wrong. (Sorry...it won't let me embed it.) http://www.youtube.com/watch?v=MepwKAIrEiI&feature=player_embedded
Well, the YouTube video has been pulled so we can't see what you're talking about. BUT.... having done a LOT... I mean a TON of gernade fishing in 67-70 in Vietnam... I can attest to the fact that it is very productive. It even works on lobsters in the ocean. We usually added a little ump to the bait by wrapping the gernade with C4 first.