Analyze This

I saw a car on my way to work this morning with a sign in the back window that said “FREE PRAYER”. It was a cardboard sign with block letters written in black marker. It looked like the sort of sign a panhandler would hold. Help me, because I can’t quite figure something out. Does it mean “FREE PRAYER” in the “Free Winona” sense? Like, prayer needs to be freed from some prison? You know, I always suspected prayer of being a criminal. Or maybe it means “FREE PRAYER” as in “I’m giving away free prayers. First come, first serve”. That would actually be a good idea because you know how much people like to get free stuff.