If you love shakes, you’re in luck on St. Patrick’s Day! SONIC Drive-In is offering 50% off all of its shakes today, Thursday, March 17 — all day. Choose from 23 sweet, delicious flavors. Each topped with whipped cream and a cherry, of course. Its shake menu is divided it into two types — Classic Shakes and Master Shakes. The sizes and prices before the discount for Classic Shakes (vanilla, chocolate, strawberry, banana, peanut butter, caramel, hot fudge and pineapple) are a mini for $1.99, small for $2.99, medium for $3.79 and large for $4.49. The sizes and prices before the discount for Master Shakes (all other flavors) are a mini for $2.49, small for $3.49, medium for $4.09 and large for $4.99. There’s no limit, so everyone can get a “shake down” without breaking the bank. New to its shake menu, this year — Creamery Shakes: Wildberry & Lavender, Bourbon Brown Sugar, Buttered Toffee, Dulce de Leche, Vanilla Bean and Dark Chocolate. There’s no limit, so everyone can get a “shake down” without breaking your “pot o’ gold.”