One of my local gaming group, who's new to gaming in general and had never played Shadowrun before, got hauled in as a playtester for Ancient Pawns. It seemed like a good idea at the time, especially since AP is going into the convention mission pack stuff, and made specifically for con gaming (where sometimes you get someone who's totally new to the game).
He randomly pulled the Weapons Specialist pre-gen, saw that they had guns and two katanas, and kind of went into Deadpool mode. I tried to explain that his character was a generalist and kind of a "support combatant" (largely because the Weapon Specialist pre-gen could be made a hojillion times better by a little chrome), but he was in full-on Wade Wilson mindset, leaping into the fray, wisecracking, and trying to skewer stuff with his katanas instead of really listening to what was going on or paying attention to what his character was actually good at. A dwarf KO'ed him with one punch, mid-adventure, and he toned it down a little after that.
Ahhh, good times.