Post-boil Pre-yeast sample fermenting?

[a_gunslinger]

Hello! Took a sample from an ESB I was brewing while transferring to fermenter and before adding any yeast. Check gravity and left it on counter. HAd no foam, just lovely liquid. Next morning I get up and it looks like it was fermenting, without any yeast added. That looks like krausen

 

[Vale71]

Congratulations, you re-discoverd spontaneous fermentation.

 

[a_gunslinger]

Kewl! Who knew? I guess everyone but me ;^)