Ewww. I allowed one of my players to run a kender pc .......once. One night, while the rest of the party slept, the little bastard got curious and horked the wizards spellbook. The wizard woke, saw the kender trying to read his spellbook, there was a 'heated' discussion, followed by a party-wide fist fight, followed by the kender being crispy-fried by a lightning bolt, which caused the entire cave complex to collapse on the party, effectively ending the campaign. Good times.