Workplace Casual Fridays can quickly get out of hand, as employees get out of their normal clothes. Just ask the bossman pictured behind the office desk addressing his underwear and slipper wearing subordinate; he'll testify to an employee appreciation policy gone way beyond the bounds of good taste and office decorum. But it's all for the good cheer and great hilarity of any of your fellow colleagues or coworkers, friends or family members, who are celebrating a Birthday. They'll get a big laugh and lots of delight out of the colorful, clever, humorous Birthday joke greeting card.