Sonic Drive-In is “shaking” things with up again by bringing back its very popular sweet offer. The burger chain’s daily half-price Happy Hour on drinks and slushes from 2 p.m. to 4 p.m. does not include shakes. However, if you’re willing to wait a few hours, you can enjoy a late-night treat and save a few bucks. For a limited time, after 8 p.m., all shakes are 50% off. There’s no limit, so everyone can enjoy a cool treat on a hot night without breaking the bank.