The evidence is in. Audiences are looking for laughs this Christmas season.

“Ham for the Holidays,” the new farce by Santa Rosa’s Shad Willingham, just premiered Dec. 4 in the Studio Theatre at the 6th Street Playhouse, and ticket sales have been good enough to warrant adding three additional performances: 8 p.m. Dec. 17 and 20, and 2 p.m. Dec. 19.

Willingham (left, above) wrote, directed and co-stars in the show, set on Christmas Eve, 1939, at a smalltown Georgia  radio station. The cast also includes Dodds Delzell as a the cranky station owner and Christmas Collins as a method actress who insists on costume changes, even though she’s on radio. (That’s why she’s dressed like Dorothy from “The Wizard of Oz” in the photo.)

If this show sounds a little wacky, you’ve got the wrong impression. It’s extremely wacky.

The script employs just about every tried-and-true joke formula there is: sarcasm, wordplay, deliberate mispronunciation, mistaken identities, tongue-twisters, double entendre and outrageous similes (“more trouble than a porcupine in a rubber raft”). Add in the slapstick and quick costume changes and you’ve got an evening of fast-paced comedic showmanship.

Tickets cost $17-$22. 523-4185, 6th Street Playhouse.