I'm from Germany and you need to redo your signature if it doesn't match you official's, when for example opening a bank account. I needed to draw my signature on a tablet to get my ID, and was unable to do so properly, because my hand is just gliding on a glass surface. After several tries they gave me a paper to write my signature on.

I've heard stories from friends that their bank mails them whether a transaction is supposed to happen, because their signature was sloppy.