One example of a humorous quote that is appropriate for a man's birthday is "Men are like wine: some turn to vinegar, but the best improve with age." by Pope John XXIII. Another example is "The follies which a man regrets most in his life are those which he didn't commit when he had the opportunity." by Helen Rowland.
Quotes such as these are appropriate to use in birthday cards, texts and emails addressed to men. Adding a quote to a card is one way to personalize it and make it stand out more. Quotes are one of many ways to acknowledge the greatness of a friend, family member or co-worker. Funny quotes also help bring a smile to people's faces and lighten up their days. Consider the personality of your recipient prior to selecting a birthday quote, as he may find some forms of humor offensive.
Many funny quotes are from famous comedians, writers, philosophers and commentators. Another example of a funny quote from a famous person that may be included in a birthday wish is "I will never be an old man. To me, old age is always 15 years older than I am." by Bernard M. Baruch.