The customer contract at the tattoo shop I worked at required customer to take full responsibility for understanding their tattoo, especially non-English words.

Also customers had to attest that they are not or have ever been a lawyer. The only person who read the entirety of the contract admitted she was a recovering lawyer. The tattoo artist made an exception.

Random side note: the artist I worked for fought for legislation to require tattoo ink manufacturers to publish the ingredients they use. Anyone know if such legislation ever passed?