Mole rat repellent

Mole Rat Repellent is a special green chemical concocted up by Moira Brown of Megaton to try and repel mole rats away from the user. It is given to the player (conveniently placed onto a wooden stick) to smack numerous mole rats for testing to put into her Wasteland Survival Guide. Upon testing it, the discovery is made that instead of simply repelling the affected rat it causes some kind of reaction which results in the affected mole rat emitting smoke for a short period before their head explodes violently in a cloud of blood and gore.