The person I got this from says that these guys were fishing ... yes that is a hand grenade.

http://www.gophoto.it/view.php?i=http://dragonlaffs.files.wordpress.com/2013/03/14.gif#.UgrmspKG18E

 

    rookies... you have to toss em out wards... yes I have done this but off a ship. lol...

Probably won't be trying that again.