Here are some of the best Pi Day deals on pizza and pie. Royal Perks members who spend a minimum of $3.14 at Burger King on Pi Day can receive a free slice of Hershey’s Sundae Pie, per Burger King. For the 12th consecutive year, Blaze Pizza guests who order one 11-inch pizza will get a second 11-inch pizza of equal or lesser value for $3.14.

Sure, it's a nod to 3.14, the never-ending number that describes a circle's circumference, but the reason people show up for it each year isn't because they're