Berocca is a Vitamin B Complex supplement. Its message of "Think Sharper Act Faster" is targeted at white collar workers looking for that edge to get ahead. That's why these stickers were placed in various lifts in major office buildings around the city. The stickers, which were placed over the floor buttons, forced people to quickly solve simple math problems to determine their floor (e.g. a sticker that stated '1+1' was placed over the '2' button).