I find it's not possible to walk past horsechestnut trees at this time of year without automatically looking down for conkers.
We were out for the day yesterday as a family, and on the walk back to the car there was an avenue of conker trees - we were all at it, even DH was throwing stuff up to try and knock down a few, they were hanging there already split open and JUST SO DAMN TEMPTING.
And yet - actually, conkers are completely pointless aren't they? DS1 (11) had his pockets stuffed full and was absolutely delighted, and DS2 (3) got right into it. It was really fun, but did make me wonder why we do it and why it's so satisfying.