Ten signs you know you're never going to see the end of the dungeon.

1. You've barely stepped in the dungeon when the tank is already running ahead and grabbing a large group of bad guys.
2. You say "Hello" or "Hi" and nobody says "Hi" back.
3. The tank is wearing dps gear.
4. The healer is wearing dps gear.
5. You're two mobs into the dungeon and someone has started griping about someone else.
6. You're two mobs into the dungeon and the party has died...again.
7. Turns out that the tank's gear is in much need of an upgrade. This could be because he/she is wearing leather when he/she could be wearing mail. There could be severely horrendous items equipped, such as level 5 gray items in a level 15 dungeon.
8. The tank cannot maintain aggro, resulting in ... more griping!
9. Either the tank or the healer leaves. This results in a mass exodus. Who really wants to wait for another tank or healer?
10. 2+ of the players in the group are under 13. (Sure, this one can't really be proven as a deciding factor for failure, but...)