When the party’s over

You drew the short straw and ended up with the unenviable task of being designated driver for the night. You resign yourself to a long night of club soda and cocktail nuts and manage to make it all the way to the agreed-upon twelve o'clock final round. But your jolly companions have different ideas, and with eyes out of focus and beer on their breath, the call goes out for "just one more for the road!"

Nobody like to be a wet blanket, but you've had enough. What do you say to convince your drunken friends that it really is time to go home?
 "If you stay out any later, there's going to be hell to pay when you get home."
 "If I don't get home soon, I'm going to have to sleep in the dog-house."
 "You've already had enough. Let's go before you make yourself sick."
 "Come on, party's over. I've got to get up early tomorrow."

Source: Kokology - The Game of Self-Discovery