Many people's signatures look like squiggles anyway, so it would be easy enough to forge them on the spot.
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Have you ever tried to copy someone else's signature? It's not exactly easy to do quickly and accurately. And as you're writing it won't look natural, so that's part of what they look for too, not just the end result matching.
Anyway, yeah. We have credit cards with chips and pin numbers up here. When I'm in the States it's funny how behind all retailers are in adopting security measures for the card. I haven't bought something with my credit card in Canada and not required a PIN in something like 2 or 3 years, now.
Jam it back in, in the dark.