Whataburger fans rejoice! Today, in honor of what would have been founder Harmon Dobson's 100th birthday, Whataburger invites fans to enjoy an original Whataburger for just $1.00 plus tax today, Oct. 8, from 5 to 8 p.m. (dine in only).

So, how can you cash in on this yummy opportunity? Whataburger customers can claim this limited-time Facebook Offer through the Whataburger Facebook page and redeem it at any Whataburger location Tuesday evening. Airport locations are excluded from this offer.

Head over to Whataburger's Facebook page and click "Get Offer," which will then be sent to the email address associated with their individual Facebook account. Customers can present the printed offer from their email or show the offer on their mobile device while dining at their neighborhood Whataburger Tuesday evening between 5 and 8 p.m.