The Unusable Coupon

A few months after dropping my business card in a contest bowl, I was sent an email coupon from Jersey Mike's. I like Jersey Mike’s subs so I printed out the coupon and tried to use it. They told me that they do accept that coupon but not if it’s a print out. What!? They sent me the coupon in an email. How in the world am I supposed to use it if I can’t print it out? Am I supposed to bring my entire computer down to the restaurant, plug it in, and show them the coupon on the monitor? I know it was just a little coupon but that’s ridiculous.