Did you ever wonder how much - or little - attention is being paid to your credit-card signature?

Full-time prankster John Hargrave asked himself the question and decided to investigate just how crazy he could make his signature before someone would notice.

Hargrave performed the prank with the intellectual assistance of his online readers at comedy-site Zug.com and got away with making funny scribbles, drawings and more cynical signatures like: "I Stole This Card".

Pranks like this will soon be history when ID verification systems go biometric - so, express yourself while you can!

• The Credit Card Prank