Private dice? Oh yeah.
I don't even let my dice play other games. :) I've got a set for DMing, a set for playing D&D, one for Chez Geek (a card/dice game), one for my Warhammer 40k Harlequin army, one for my WH40k Tau army, one for my Eldar BFG army, one for GURPS, one for Star Trek RPG, an...