There are actually two things that keep me interested in the game every time I stop to actually think about it... and both happened with the same group.
1) I rolled up a bard (not a huge thing) and the DM- realzing my acting ability and my love of "role-playing" during the game- asked me to allow my bard to be slightly (?) nuts. As it turns out, my bard had a personality that split 5 for 1: A human bard, a human paladin (with no special abilities), a gnome illusionist (with bardic spells), a gay haberdasher (with no adventuring skills at all), and an extremely nerdy young adult with NO skills period. Any time he was pout under stress of any kind (combat, seeing undead, falling down a cliff, eating a piece of
raw chicken, whatever) he had a chance of switching personalities. I had more fun playing that character becuase I had no clue what was coming next, and it gave me a chance to realkly expand my role playing abilities... of course, I used my Feat adds to buy off a few of the personalities as time went on.
2) a very impish wizard who handed my bard a sheet of paper on which was written, "I learned how to cast Explosive Runes today". My bard opened and read the paper, only to have the stinkin' thing explode in his face.
We all had a decent laugh over that one.
well, then there was my step-son's female cleric with the 8 dex and 16 con. He decided that he would play the female Friar Tuck character whose motto was "Eat ,Drink, and be Merry... for tomorrow we Eat, Drink, and be Merry again". Every time the battle would be over, and a character was in severe need of healing, the cleric would complain about having to put down her freshly poured mug of ale (she poured it out of the flask into a mug to drink it) to heal said party member.
You have to love the imagination of youth who don't realize something is impossible. lol