He bored him to tears, too. Some obsessions recur less frequently. A young man I know has a fascination with Sir Paddy Ashdown, to whom he attributes superheroic skills. Obsessions can tip over into phobias, and an autistic phobia can be very controlling. Since all three feature prominently in the average primary school day, life with Andrew can be hazardous.
Obsessions come and go according to mysterious and ungovernable laws.
The worst I've heard of is a compulsion to inspect the wheels of moving cars. I'm keeping my fingers crossed - it's as effective as anything else. This is the first in a series of fortnightly columns.