This reminds me of the kid who wanted a Gatling Tesla-Shotgun Cannon.
lmfao, you can't be serious? like, in those words specifically? my god, what is the world coming to....
if he gets a gatling tesla-shotgun cannon I want a silenced plasma-rocket-launching uzi.
on topic, I wouldn't know about any other fallout then 3 & NV, but from those I'd have to say my favourite(and most ridiculous,expensive,hardly-usable weapon) would probably be experimental MIRV... maybe even euclid's c-finder, when used correctly...