Exhibit 99.1

JOINT FILING AGREEMENT

The undersigned hereby agree that the Statement on Schedule 13G dated August 2, 2010 with respect to the shares of Common Stock of Sonic Corp., and any further amendments thereto executed by each and any of the undersigned shall be filed on behalf of each of the undersigned pursuant to and in accordance with the provisions of Rule 13d-1(k)(1) under the Securities Exchange Act of 1934, as amended.

Dated:  August 2, 2010	THE LION FUND, L.P.
	By:	Biglari Capital Corp. General Partner
	By:	/s/ Sardar Biglari
		Sardar Biglari, Chief Executive Officer

BIGLARI CAPITAL CORP.
By:	/s/ Sardar Biglari
	Sardar Biglari, Chief Executive Officer

BIGLARI HOLDINGS INC.
By:	/s/ Sardar Biglari
	Sardar Biglari, Chief Executive Officer

/s/ Sardar Biglari

SARDAR BIGLARI