Respond to a comment you received about making a typo three times and address the need to point out such mistakes.
Make that three time's.  Oh, I knew you'd suggest it wasn't  a typing mistake. 
Is it really necessary to point out especially when I rarely make such errors?   I see worse and have the courtesy to let it go.   In the meantime, I'll practice reading over my messages more in order to catch such ridiculous mistakes.