What is always in front of you but can't be seen?

An older, white haired man walked into a jewelry store one Fridayevening with a beautiful young gal at his side.
He told the jeweler he was looking for a special ring for hisgirlfriend.
The jeweler looked through his stock and brought out a $5,000 ring andshowed it to him.
The old man said, "I don't think you understand, I want something veryspecial."
At that Statement, the jeweler went to his special stock and broughtanother ring over.
"Here's a stunning ring at only $40,000," the jeweler said. The younglady's eyes sparkled and her whole body trembled with excitement.
The old man seeing this said, "We'll take it."
The jeweler asked how payment would be made and the old man stated, bycheck. "I know you need to make sure my check is good, so I'll write itnow and you can call the bank Monday to verify the funds and I'll pickthe ring up Monday afternoon," he said.
Monday morning, a very teed-off jeweler phoned the old man. "There's nomoney in that account."
"I know," said the old man, "but can you imagine the weekend I had?"
Don't mess with Old People.