I remeber a merc saying something along the lines of "Well, looks like you just wanderd into the free fire zone, its target practice time" Might have been in two separate taunts, its been a while since i ran into any mercs.
"Ow, fuck you blinded me" Many people
"ARG, muscles.... bulging... stats... increasing... gaining... level..."Marcus
"We be ripping out your heart an showin it to you now" Sulik
"Ever see what one of these does to soft tissue? Watch this"Enclave patroler
Those would be my favorites.
And "Not my spleen, anything but my spleen" Alot of people seem to say this, well, mostly new reno gangsters.