Threadgill's: FREE chicken fried steak..??

I heard on the radio at lunch a quick mention of FREE chicken fried steak at Threadgill's. I tried to do some research, and couldn't find a mention of the offer on the Threadgill's site, but did find this mention on KLBJ's site. There it states the offer is good at the north location ONLY, and only 4/13 - 4/19 from 4 p.m. to close. Might be worth a call before you go:

Threadgill's
6416 North Lamar
Austin, Texas 78752
(512) 451-5440

UPDATE: here's some more information from the Statesman.