Not as good as my mate Martin. Norwich museum does a tour of the dungeons, at one stage the curator says "now, imagine boys and girls, what it would be like to be a prisoner in the dungeon!" And flicked the lights off. It was pitch black, bible black. Martin limbered up and did a bellowing barking burp, it was like a walrus, bout 120 decibels. The lights came back on and nobody does a straight face as well as my mate, he even frowned slightly and looked around accusingly. " Well" said the curator " let's move on".