Mine too
I was a cheque signatory for years and as such my signature has deteriorated into what looks like one of those hospital heartbeat monitor pulse thingies.
( Monty Boyce, My cheese game is strong, Mon 4 Oct 2010, 15:57, 2 replies, latest was 15 years ago)

I don't sign things often
so mine has an enormous flourish on the end. Praise be to surnames ending in Y!
( Vipros. clever got me this far, then tricky got me in, Mon 4 Oct 2010, 16:00, Reply)

I cross the last three Ts of my name
with a huge Z shaped scribble. It's like Zorro came and stabbed it.
( Kitty v1.0 desperately naive, Mon 4 Oct 2010, 16:05, Reply)

I approve of this

( Vipros. clever got me this far, then tricky got me in, Mon 4 Oct 2010, 16:05, Reply)

yes
exactly that. mine doesn't fit on the back of my card at all.
( rachelswipe with a fork, Mon 4 Oct 2010, 16:07, Reply)