Who knew about the boo!!

Booing is an act of showing displeasure for someone or something, generally an entertainer, by loudly yelling boo (and holding the "oo" sound) or making other noises of disparagement, such as hissing.

Booing performers has a very long history, The first written record comes from ancient Greece. At the annual Festival of Dionysia in Athens, playwrights competed to determine whose tragedy was the best. When the democratic reformer Cleisthenes came to power in the 6th century B.C., audience participation came to be regarded as a civic duty. The audience applauded to show its approval and shouted and whistled to show displeasure. In ancient Rome, jeering was common at the gladiatorial games, where audience participation often determined whether a competitor lived or died.
In sports, booing by fans is quite common.In the process of booing, members of the audience sometimes will throw fruit, vegetables or garbage for particularly bad or contemptible performances

At least no one was put to death or hit with a kumquat!