Riders whirl feverishly in big teacups. Alice in Wonderland’s Mad Hatter provides the theme. Teens like to lure adults onto the teacups and then turn the wheel in the middle—making the cup spin faster—until the adults are plastered helplessly against the sides and on the verge of tossing their tacos. Don’t even consider getting on this thing with any person younger than 21. Against our better judgment, here’s a tip from a reader we’ve dubbed Melba the Human Centrifuge:

If you want to spin your teacup, don’t put more than three people in one cup.