I'm kind of a sensitive person, keep in mind. I just read where the groomsmen wrote help me on the bottom of the groom's shoes. Neither of them knew (supposedly). The bride was upset. The comments were that the groom probably knew or did it himself and the groomsmen took the heat. Some brides can laugh it off but I would be embarrassed and upset. What can you do then? Everyone is watching. What would you do with groom later?
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It has nothing to do with having a sense of humor. Nervous giggling or an honest mistake on a name is a huge difference than a deliberate prank while taking a vow before God.