I found this one on Google. Unfortunately, I can believe that someone at the History Channel made this error because lots of people do. I even made it in a post once and even admitted it (here). But really. then and than are not that difficult. Then has an element of time (and then and time both have the letter “e”). Than refers to a comparison (and than and comparison both have the letter “a”). So now that you know better, here is day 2 of Thanksgiving Grammar Giggles.