This is a theme inspired by Nemesis's post. Have you ever had something that makes you crack up a little too much, that you are in uncontrollable fits of laughter over, and no one else gets?

Back when I was at college, I saw a computer demo by the "Psychic Monks" (for the uninitated a 'Demo' is a computer program done by a talented group of programmers, artists and music type people showing off their skills - there is/was a whole scene around this called the demoscene. A lot of the creators of this sort of stuff are the sort of people who end up making computer games, or working in TV or media)

Thing was I mistook the name and thought they were called the "Psychotic Monks". This generated in my mind a vision of a group of monks, in their brown cladding, foaming at the mouth, jumping up and down, with knives in their hands and a crazed look on their faces. It was one of those thoughts which at first tickled me, then made me laugh hard, and end up creased up on the floor in tears of laughter. No one else understood what an earth I was laughing at, and that makes it funnier, as you incoherently try to stammer "Psychotic Monks...." before breaking into another fit of laughter.

After that, any of my friends only had to mention it to set me off again. About a week later I thought I had it under control, and had completely got over it all...until my friend said "Pyscho's in Sandals!" and I was back to square one. I nearly got chucked out of a lesson I was laughing so hard.