Bring a soccer ball, basketball....

Bring a soccer ball, basketball, football, or baseball. Start a game... in the kitchen.

http://www.101funjokes.com/boring_party_jokes.htm

Whisper to the guest on your right...

Whisper to the guest on your right, "What kind of lame moron actually goes to these parties, anyway?"

http://www.jokes-db.com/jokes/boring-party-jokes

Tell a middle aged man...

Tell a middle aged man, "Your wife seems very happy with that boy in the closet..."

http://www.jokes-db.com/jokes/boring-party-jokes

Tell a middle-aged wife...

Tell a middle-aged wife, "Your husband seems very happy with that girl in the closet..."

http://www.jokes-db.com/jokes/boring-party-jokes

If you find your former ....

If you find your former dancing partner dancing with someone else, burst into tears, wailing "I thought you loved me!", and run from the room.

Ask the host...

Ask the host, "Who threw this cheesy party, anyway?"

http://www.jokebuddha.com/joke/Ask_the_host_Who_threw

Play a lullaby on a...

Play a lullaby on a kazoo during a speech (singing a lullaby works okay, too)

http://www.jokes-db.com/jokes/boring-party-jokes