It was bramble beer for me. Put a load of lovely ripe brambles in a batch of homebrew beer, one of the little pithy bits on the inside wedged up against the bottom of the airlock, and overnight the pressure built up enough to pop the cork out and spray the ceiling with brambly splats and beer.

Tasted okay though.

My mate brewed his bramble beer by putting his brambles through a juicer and only adding the juice and pulp, because he's cleverer than me and has a certain amount of foresight.