"What would you do for a Klondike bar?" is a popular advertising slogan that has been used by Klondike for over forty years. The slogan has become an American icon and is commonly referenced in pop culture. The idea behind the slogan is to encourage people to have fun and be spontaneous by doing something silly or ridiculous for a Klondike bar.

Some examples of what people have done for a Klondike bar include acting like a chicken, laying bacon on the floor, and performing a ridiculous dance. Klondike has even created a game called "What Would You Do for a Klondike Bar?" where players complete a series of creative, courageous, and cockamamie challenges in a race to collect all six Klondike bars.

In summary, people have done a variety of silly and ridiculous things for a Klondike bar, including acting like a chicken, laying bacon on the floor, and performing a ridiculous dance. The idea behind the slogan is to encourage people to have fun and be spontaneous.