Effect Xmas

I never knew I didn’t know this.

Recently I may have professed that I knew the difference between affect and effect and it is confirmed for me today online at Common Errors in English. I did not think that Xmas was a way of removing the Christ from Christmas but more of a lazy person’s way of avoiding writing letters. Turns out, I was wrong and the X is an abbreviation of the Greek for Christ [Source]. Just goes to show that I know nothing.