There are many funny and heartfelt sayings for a 20th birthday on the Internet. But a birthday card makes you happy, especially when the words come from the heart. So it is best to write a short personal message for the birthday child that fits the individual person and their life situation. A creative slogan or a short rhyme are particularly well received. If you can't think of anything at all, you can use texts from the Internet as a guide and transform them a bit and personalize them.