Upon further consideration, my favorite weapon from Starship Troopers is not the Marauder, but rather, the Thirty Second Bomb.
So called because, when you threw it through a window, it would audibly announce, in the pre-set language of your choice:
“I am a thirty second bomb! I am a thirty second bomb! Evacuate the premises immediately! Twenty nine! Twenty eight! Twenty Seven…”
Designed to be thrown into crowded confined areas such as bunkers or occupied buildings. Has about the effect you expect it to on a bunch of surprised frightened people who know that you do not deploy weapons which lie to them.