There was a guy who worked for Blockbuster video.
He found it to be a great but complicated job.
One day he was at the register and a older man came in and asked if he could buy a phone card.
So the guy gave him a card, and he wrote him a check for $39.80.
He then told him that it was 20 cents short, so he gave him 2 dimes.
Unfortunately when he typed this into the computer, he missed the period on the keyboard and it came up as 20 dollars.
That night, the manager said that he was $19.80 short.
The manager thought the guy had stolen it, so he fired him immediately.
And the moral to this story is: 'Guys get in trouble over missed periods!'