Getting the cartoon idea straight away

It's rare as a cartoonist to come up with the right idea straight away. Normally there's lots of scribbling and frustration. But it does happen. I was asked to draw a cartoon to accompany a newspaper story about a prison with an excellent recycling record. Being a cartoonist, the very first thing I thought about was a convict's suit with arrows on it. Which led immediately to this:

Note: the number on his suit is today's date!