[RickJ]

10. There are half-full, brightly-colored plastic cups on the floor in every room. Three are in the bathtub.

9. There's always that one girl, bawling her eyes out in a corner.

8. It's best not to assume that the person closest to you has any control over their digestive function.

7. You sneak off to the bathroom knowing that as soon as you sit down, someone's going to start banging on the door.

6. Probably 80% of the stains on the furniture contain DNA.

5. You've got someone in your face at 3 a.m. looking for a drink.

4. There's definitely going to be a fight.

3. You're not sure whether anything you're doing is right, you just hope it won't get you arrested.

2. There are crumpled-up underpants everywhere.

1. You wake up wondering exactly how and when the person in bed with you got there.

[Alty]

Number 1 is my favorite, especially since I woke up with my daughter in the bed this morning, and I seriously don't remember her joining us. Sneaky little bugger. ;)

Number 6 is very true too, but in our house most of the stains are attributed to the dogs. :(

[KC13]

Didn't make the top 10, but worth honorable mention: Dirty togas and soiled diapers look eerily similar...