If the artwork is so indiscernible that the group just gives up trying to guess, the artist has to take a shot. Everyone sits in a circle and one player goes around bopping people on the head, telling them to "sip." Each bopped person takes a sip of their drink until the bopper choses someone to say "shot" to.
The shot person has to leap up, chase the bopper around the circle, and try to tag them. The first person begins by saying, "I'm going to the bar and I need to get a mojito" (or any other alcoholic beverage).
If they're wrong, *they* drink; if they're right, *you* drink (one gulp for every person who guesses correctly).
Before your guests arrive, brainstorm a "slip it in" phrase for each person who's coming to your party: This is a phrase that they'll endeavor to "slip in" to casual conversation over the course of the night...without anyone realizing it.
Put a bag on the ground and have everyone stand in a circle around it. This keeps going and going until all that's left of the bag is the very bottom.
On the count of three, everyone looks up and stares at another player. Participants have one minute to transfer as much of their drink as possible from one cup to the other using the spoon.
If you find yourself looking at someone who isn't looking at you, you're safe. Everyone revolves around a Ping-Pong table taking turns serving the ball. When the minute is up, you have to drink whatever's left in the original cup.
Players take turns being the timer and being the artist.
At the beginning of each round, the timer will whisper a word to the artist and start the clock.