What is your silliest reason for doing something?

[Suicune's Fire]

This was accidental, but one of my friends, who is just so quirky and hilarious and awesome, never remembered her own phone number, and because she's her, she would call me to ask me what her number was because she knew I'd have it. I got so used to telling my friend what her own number was that I accidentally memorised it and it's been like ten years and I can still remember it without a problem. XD