Some of that sounds exaggerated, but the claim that the foam could hold a quarter could very well be true. Sam Adams makes this claim, too, and it isn't too far fetched to believe that a stiff-foamed head, with small, tight bubbles could hold a coin on top.
Third Floor Cellars Brewery
Brewing in my 5 cu. ft. "basement" since 2010
Bottled: Canicule Saison, Easy Chap EPA, Little Bear Kölsch