Good wedding toasts typically include humor, irony, rhyming or famous quotations. Typically, such wedding toast openers are followed by sincere thoughts about the bride and groom.
Examples of humorous toasts include expressing the desire that the bride share everything with the groom, including housework. A humorous toast from the groom might be mentioning that everyone should cheer the bride because she knows everything about the groom and is marrying him anyway.
Ironic wedding toasts typically involve word play. One example is offering cheers to the groom and describing him as a man who managed to keep his head even while losing his heart. A more humorous groom-specific toast involves asking the groom to place his hand over his wife's hand and enjoying the moment, because he may never have the upper hand again.
A simple rhyming toast for both bride and groom is to say, "here's to the husband and here's the wife; may they be lovers for all of life!" An example of humorous rhyming includes offering cheers to "Health and prosperity to you and your posterity, and them that doesn't drink with sincerity, that they may be damned for all eternity!"
Famous quotations as wedding toasts typically include thoughts on love, such as the Shakespearean quote from Romeo and Juliet: "May a flock of blessings light upon thy back."