okay 
i’ve gone through on de_dust2 in cs:s as ct when the t’s were rushing b, run straight up mid, knifed i think 2 snipers in spawn, grabbed one of ’em’s awp, and proceeded to ace the t’s, who were camped out in tunnels and confused as hell why all their teammates were dying, so they were retreating to spawn. Granted, it’s not all knifing, and it was cs:s, but still…
then also too i’ve been known to knife 5+ people / round a few times in scoutzknivez3, especially when they all camp spawn.
but definitely, knife rushing mid and/or mid->b tunnels->t spawn->flank is so much fun 