Good point falls flat.
Can’t believe I forgot this gem!

In year 7 (aged 11-12) myself and a group of mates would sit in our form room to eat lunch and avoid the horrors of the dinner hall and hide from the fact we were the year’s outcasts.

One of the group, who we shall refer to as MB, was sat next to me, leaning back on his chair which in a science lab, it a very high stool. So great was his lean, he was using his right hand to hold onto the edge of the desk.

I forget what we were talking about, other then the fact I’d just made a point that seemed to disprove his stance on some trivial issue. He went to make his defence saying “Ah, but,” raising his right hand and extending his index finger, a mirror of the point he was about to make. Only, he didn’t. He’d let go off the desk. For a second he seemed to hang in mid air, then grabbed desperately for the edge of the desk, but alas, was now moving backwards rapidly, his hands fell short and he fell backwards, a panicked and desperate look on his face, hitting the ground hard, and totally unable to protect himself. I laughed. Hard. He was very angry with me.

Looking back, I shouldn’t have laughed, or could have at least helped him to his feet. Sorry MB, but it was the single greatest act of stupidity I have seen outside the animal kingdom.
(Mong goose, Sun 1 Feb 2009, 1:40, Reply)