Re: honey foams immediately after pouring into jars
There are only two logical explanations given the set of facts you presented.
1. Fermentation (the most likely given your description of a head like beer)
2. The honey was pretty warm when transferred and was drizzled and not gently poured
BTW there are lots of beer purists on here who would argue with your assesment that a glass of beer with a head was "badly poured".
"People will generally accept facts as truth only if the facts agree with what they already believe."- Andy Rooney