Every day's a holiday, at least in the food world.  And for July 24, it is National Drive-Thru day. To celebrate, Jack In The Box is giving out some free milkshakes.

Like several fast food restaurants these days, Jack is trying to condition people to use their online coupons systems, so in order to take advantage of this deal, you have to sign up for their e-club at jackinthebox.com/offers.

After that, you'll be able to get a free shake with any purchase on Wednesday, July 24.

Aside from a terrifying mascot and hard-shell tacos that have become iconic, Jack In The Box's contributions to the drive-thru world aren't small, as they changed the way we order, forever. Purchasing the rights to use a two-way intercom, Jack In The Box was the first fast food restaurant to incorporate the drive-thru/intercom ordering combo that has become synonymous with all drive-thru restaurants today.

Thanks to them, you can now stick your head out the window, talk to an inanimate menu board, order a Jumbo Jack, and get a free milkshake on Wednesday.

It will take a bit of effort on your part, but at this point, online/mobile coupons are the future of deals, as McDonald's, Chick-fil-A, Starbucks, and even Taco Bell have all shown.

So you can either stick it to the man and refuse to sign up for Jacks's coupons, or you can drink a free milkshake with the rest of us delighted conformists.