Rummaging round my beer cupboard I spotted an Irish beer I'd got from Booths. It was St Patrick's Best from the Strangford Lough Brewing Co. You don't often see Irish craft beers so I was very interested in seeing how this one tasted. Sadly I didn't even get as far as tasting it. When I opened the bottle it gushed out of the top in a fountain, spilling about half the bottle over my kitchen counter and floor.
There are a few possibilities for why beer can gush: over carbonation, wild yeast or bacteria infection, the use of isomerised hop extracts. But in cases like this one where it really goes mental Fusarium is the likely suspect.
This is a fungus that can infect barley and cause considerable problems for brewers (and drinkers!). I don't think the mechanism for how it causes gushing is known but it certainly does a good job of it.
I also have vague memories from when I was studying microbiology that some species of Fusarium produce a oestrogenic mycotoxin that does nasty things to the bits of boy pigs fed on infected barley. So I tipped the rest of it down the sink. I'm not taking any chances.
A Fusarium sp. is also the fungus they make Quorn from. Though obviously not a species that makes your goolies shrink when you eat it.
On looking at the label more closely it turned out that the beer was contract brewed somewhere in the EU, so might not even be an Irish craft beer anyway. I'll be giving it a miss in future.