Do you know the difference between ham and eggs? The first is a lifetime commitment for a pig, and the second is just a day's work for a chicken.

OK. The really funny jokes will be in Medford's comedy clubs this weekend. Here's the lineup.

Comedian Ron Osborne headlines at Ground Zero this weekend. The show's opening act calls himself Mustard Man. The laughs get started at 9 p.m. Friday, Sept. 21, at Ground Zero, 123 S. Front St., Medford. Admission costs $5 and includes a buffet-style dinner. Call 779-4827.

Rocky Whatule and Chris Simpson will share the spotlight at 8 p.m. Friday and Saturday, Sept. 21-22, at Chadwick's Pub in the Rogue Regency Inn, 2300 Biddle Road, Medford. Admission costs $5. Call 282-2122.