This is my silly contribution: 70% of 30 is equal to 30% of 70. This applies to other numbers and can be really helpful when doing percentages in your head. 15% of 77 is equal to 77% of 15.

Wow I forgot this existed. I somehow found myself watching one of these as a kid and was SO confused. Haven't seen one since. I hated it at the time because I just wanted to see the movie. Recommend one to try as an adult?

I have the opposite issue. I type exactly what I want to say, get distracted, then never send it. "Why didn't you reply to me?" "I did. Oh.. I never hit send.."