Dan at 20: People are having a fan argument about whether Star Trek novels are "canon."
Dan@20 could A) join in, B) play basketball, C) wash his hair for about the next eight years, D) go talk to that pretty girl.
I don't believe fan arguments ever won out, and I've gotten modestly less geeky with the passage of the decades.
I admit, sometimes I've argued with myself if something *I* wrote is canon in my universe. Those can get heated, but there's only sometimes insults or raised voices.