I made a brew yesterday afternoon. I had read that it can be quite lively so for safety's sake placed the fermenting bucket in a plastic container to catch any overflow.
By the time I was ready for bed it was fermenting well and looked like this:

When my Wife returned with our morning cup of tea in bed I asked if all was well with the brew, she said she didn't notice anything was wrong but wasn't really looking.
I then went downstairs and was faced with this



Having cleared up the mess and wiped the wall down, I found the top of the fermentation trap, it seems to have been blown right off and splashes of beer were at least 4 feet up the wall!!
Beware this is lively stuff.

mf.