"So why did he kick it?" "Is that a good kick?" "What happens to it now?" "Does the crowd give the ball back when they catch it, or can they take it home?" "So it's always the guy wearing the No2 jersey who throws the ball into the thing where all the other big guys are lining up?"
Because. Not really. It's called a lineout. They give it back. Yes, but it used to be the winger ... No he's a hooker. Yes, a hooker. I don't know why.
Which isn't true. You do know why, but having made negligible progress on the lineout front, any attempt at an acceptable explanation of the various roles at scrum time is futile. You have more chance of getting them to clean your car than you do of interpreting, at a fundamental level, the vastly fabulous fulcrums and mysteries of the modern-day scrum.
At this point you are best to keep quiet, to feign indignation at a refereeing decision, or a sloppy pass, or - and surely nothing could be more worthy of exasperation and animus - a defensive bomb, to take a swig on your beer, and to look away as if you are almost at the point of giving up on the game yourself.
Then, and only then, will come the great searching questions. The first will inevitably be, "So what happened there?" This will be followed, after the most cursory of explanations, with "So that wasn't a very good thing to do then?" And a simple "no" is the only answer that question requires.
But then, just when you are sure there can be no more questions, no more enquiries, no more high-pitched inquest; just when you think it's safe to get through six phases without the forensics, they come in for a cuddle, and watch the game in unison with with you, and in silence, for all of a nanosecond, before they ask you the best question of all: "Dad, can I go there and watch a game with you?"
And of course you say "yes", knowing full well that it'll be all about the hot dogs and the lemonade, the mascots and the free flags, the late night and the car ride and the walk hand-in-hand into the park.
And knowing full well that there'll be a hundred more interruptions as you sit in the stand and watch the next one; that they'll cheer when a try is scored, even though they haven't got the faintest idea what's going on. And you'll gladly suffer through it all over again, treasuring every second as a dad. Knowing all the while that your inadequate answers will never be a match for their endless questions.
Happy Father's Day. Now go and get a health check.