Caterpillar in the refrigerator?

Yesterday, I found a caterpillar in my refigerator!  I would have assumed
that he came in on some produce, except that he was at the very top of the
inside of the door, barely an inch from where the door would have squished
him when closing.  He wasn't moving, but I hoped he might not be dead yet,
so I pried him loose and set him on the table.  This morning, I checked and
he's turned into a chrysalis.

So a few questions:  First, can anyone think of a situation that could have
caused a caterpillar to go inside a refigerator?

Secondly, he's bright green and somewhat knobbly with three legs up front.
All in all, he's around 2 inches long and without much in the way of
distiguishing characteristics and as a chrysalis he's kind of pointy.  Can
anyone hazard a guess at what he is?

And thirdly, what are the odds that he'll survive if I hang him up inside a
jar?

Thanks,
-Nordo