This really isnt that cool but I thought I would post it any way.
I did this for Coagulation.
[Note] You must not be host so join a game on XBC or XBL on Coagulation
Ok first what you need to do is get a full set of frags.
Then go to the top of the red or blue base.
Stand on top of the set of frags on the bases.
Then throw the grenades at the teleporter.
YAY! now you cant pick up grenades.