Does anyone else have those things that everyone else seems to know ... except you? It's like you were off the day it was taught in school and you don't know that you don't know about it. But everyone else does.
I have a couple ...
First, days of the month. I don't know how or why but I am pretty clueless when it comes to how many days are in each month. I know about December (31 right?) and February is special but the ones in the middle ... it's all a bit hit and miss. It doesn't help that the stupid mnemonic rhyme that everyone seemed to learn doesn't help whatsoever because you can mix up the months in it however you like:
"30 days have that-ember, June, April and another-mber, all the rest have 31 except for stupid February"
I have to ask Angharad or check on my computer every time. Also, why does February have an extra "r" in it when everyone says Feb-You-Airey?
The last one is actually more obscure so I don't feel so bad for not knowing it but I just never noticed it until someone told me and it's handy to know. If you don't know it you'll either go and check or next time you go out you'll remember and sit there smiling and thinking "that son of a bitch was right !"
Have you ever been in a car driving up to get gas / petrol and you can't remember which side the tank opens on? Maybe it's a hire car or you always let your spouse fill up (ooh, controversial). Well, look at the fuel gauge on the dash - right next to the fuel symbol is a little arrow which will point either to the left or right where the filler cap is. Brilliant!
How about you? What can't you remember or didn't you learn that everyone else did?