Back in the 90s, this person would be said to have gone postal, but now postal has lost its edge and a more contemporary, rugged version must be incorporated.
Hub: bet your day wasn't as bad as Roger's.
Carl: why? what up with Roger?
Hub: his wife got knocked up by some kid and he Virginia Tech'd the whole family with an air hammer! skull fragments embedded in the fake Rembrandt!
Carl: (laughs so hard coffee comes out his nose) oh snap!!!
or present tense:
STOP TOUCHING ME OR I'LL TELL MOM!!!! She'll go Virginia Tech on your honky butt.