there were 3 of us in TS pirating in NY. 2 GBs and a bomber. We start pirating a train and generally harrassing him. We knew he wouldn't pay so we just kept him CDed and his shields gone. We're all laughing and another guy in TS pipes up "hey! that's me!"
So he got shown the power of the SuperNova Antimatter Canon. I refunded him his cash later, which was ooRP but the human thing to do.
But yeah, don't let someone pass just cause you know them. Tax em double if you know they're going to RP their way out. (A good trader will be able to negotiate anyway, so double isn't a huge deal)