I don't even have a signature. While I can do lovely calligraphy, my actual handwriting is a testament to a failed Rey-Osterrieth complex figure test. Now, that's extreme, but how many people have a stable signature now when they almost never have to reproduce it?
I have been asked to 'reproduce' a signature once in my entire life. At a 7/11, buying $6 worth of food. It took 4 tries to satisfy the cashier, because my signature is completely inconsistent. I almost refused, but I was curious whether I was even capable of signing convincingly.
To this day, I have no idea what drove that decision.