Think of it this way, has not there been a day when you were told a joke by a friend or relative on the phone or via SMS, and you kept on thinking about the same throughout the day and had a great, stress-free working experience. You might also have spread the cheer by telling the joke to your colleagues, thereby also brightening their day and bringing some laughter in their lives. Is not this proof enough of what a great joke can do to your entire day be online. There are many kinds of redhead jokes, lawyer jokes, doctor jokes, and so on, giving you ample variety in terms of choosing the kind of laugh you want to have according to your taste.