Printable humorous birthday cards are a very popular way of wishing your friends and family on their birthday. There are many websites which offer a wide range of funny cards that can be customized and printed according to your preferences. Online providers of humorous printable birthday cards are American Greetings and Net Fun which have a big collection you can choose from. Some of these websites are free and some might require registration or a nominal fee.
Once you find a card where you feel the receiver will appreciate the humor in it, select the card and add additional details or customize it, like giving names of the sender and receiver, add borders or any other style or you can also add a new picture including your own to make it more personal. Save the birthday card into your hard disk of your computer and take a print out of the card in a good quality paper so that it looks vibrant.