How can so varied people make the same mistake?!

Last year, when I arrived in Calcutta, I obviously took a new number. And I mailed many people informing them about my new number. And they did it without any issue.

Now, there are always some people who either ignore such mails or do not take action right away and some people are inadvertently left out from mailing list. These people asked for my number over gtalk and I gave them my number then and there.

Here, starts the interesting part. All and yes, I mean ALL of my friends who took my number over the chat got it wrong. My number ends in '336' but all of them noted it incorrectly as '366' When they tried calling and could not get through, they pinged again and asked and got it correct this time. I thought that maybe I wrote it incorrectly but that was not the case, thanks to saved chat in Gmail!

What prompted me to write this today was the time when the same thing happened again a few minutes back. A friend wanted to talk about his MBA admission and all and took my number over the chat. And ya, he got it wrong too :D

Cant think of any conrete reason for this ;)