The man’s a born liar. He never would have cracked so easily. 

[…] I paid a visit to the fairies, or rather, a visit to their ample supply of magic. Now, this potion can temporarily reverse any spell those do-gooders cast. They made him real. This can undo that.

I promise you, dearie, this is gonna hurt - Mr. Gold

Caffrey, you only had to be good for a couple of hours, and as long as you got two good legs, you’re gonna find a way to run. No more running, Caffrey - Agent Collins