Reading the Miranda thread I was reminded that when I was young I totally misunderstood the bit at the end of David Croft shows where it said "You Have Been Watching." I used to think it just meant I had been watching television and they were showing off about the fact that they had viewers. Took me ages to realise they were saying who I had been watching in the cast.
On similar lines, it only just occured to me last week that Q.I is I.Q backwards.
Do BCGers have any similar confessions to not getting something about a TV show until much later?