Acid 2.x
Examples:
Grocery store cereal aisle in Florida, USA: Go to the first shelf, first row, and the sixteenth box of cereal () may be a very specially-marked box of Trix. Silly wabbit!
Candy machine in train station, Scotland: Press pull knob, and get a super surprise with your M&Ms.
Orange juice street vendor, Morocco: Approach with your own cup from the east at sundown, circle the vendor three times clockwise, two times counterclockwise, five times clockwise while chanting “Tlata, zuz, xemsa” (), then listen carefully for instructions.