Can you change the moisture content in popcorn?

If the unpopped popcorn is too dry, it will not pop, as it is the pressure from steam building up inside the popcorn shell which makes it pop. To remoisten dried out popcorn one could try to put the popcorn in a plastic bag or airtight container in the fridge with some slices of raw potato. The moisture from the potato slices should then evaporate and get absorbed by the popcorn.