A guy goes into the pet shop and asks for a parrot. The clerk shows him a big red bird with two ribbons, one on each leg.
"What are those ribbons?" asks the customer.
"When you pull the ribbon on his right leg, he sings "Chestnuts roasting over an open fire" and he sings "Jingle Bells" if you pull the string on his left leg.
"Wow!"says the customer. "What if I pull both ribbons at the same time?"
"He falls down."