Talking Clock

While proudly showing off his new apartment to friends, a college student led the way into the den.

"What is the big brass gong and hammer for?" one of his friends asked.

"That is the talking clock," the student replied.

"How's it work?" the friend asked.

"Watch," said the student, who then proceeded to give the gong an ear-shattering hit with the hammer.

Suddenly someone screamed from the other side of the wall, "KNOCK IT OFF, YOU IDIOT! It's 2:30 in the morning!"