Take today - I heard there was a nephews and nieces trip to go ice skating at Somerset House. Fab, except they have a timed ticket system and but when I got to the web site the time my brother had chosen was all sold out.
Oh bother. But decided might as well go for the previous slot as that way a) get a skate and b) get to see them in the handover.
Then my brother mysteriously discovered he had one spare ticket, so was able to head right back out onto the ice.
And why was this a particularly good thing? Well to be honest hadn't been on skates for a period of time measurable in decades so the first few minutes the first time round were to say the least wobbly.
But by the second go when the youngsters got out there their uncle was able to skate behind them, in front of them, give a steadying hand, race them, watch out for them and pick them up after the inevitable tumbles.
Then it was time for a quick mulled wine before heading off to our separate corners of London.