There is a strictly enforced ban on chewing gum in Singapore that has been in effect for decades. Bringing chewing gum into the country even for personal use is illegal.
Singapore gives random drug tests to tourists and locals before they can enter the country. They must be negative of any illegal drugs before they can enter.
It’s illegal to pee in an elevator in Singapore, and that some elevators have a Urine Detection Device which detects urine odors, sets off an alarm, and close the elevator doors until the police arrive.
In 2000, Singapore’s McDonald’s restaurants gave out Hello Kitty dolls adorned in wedding gowns. The promotion was so popular that people went to McDonald’s and bought more hamburgers than they’d intend to eat, discarding the meat to get the toys. Unfortunately, supply of the dolls didn’t quite reach demand, leading to a riot in one franchise. Due to the violence, area McDonald’s did something unheard of for a hamburger vendor — they limited the number of hamburgers that any one customer could purchase at a time.