[Prodigal Son]

Really? Never asked to sign your name?

Homer Simpson says "Doh!"

That is an excellent point. Although to be fair, after having had to sign my name too many times in the military, my signature looks nothing like it did when I got out of school and isn't legible (as far as being able to tell what the scrawls actually say). It does look like the scrawl on the back of my credit card, however, and store clerks seem to be generally happy with it when they compare the two.

[NonZeroSum]

A signature doesn't have to be legible--it just has to be unique and recognizable. There is no way to tell what my name is from my signature, but it is my signature, nonetheless.