20 Silly Grammar Mistakes That Even Smart People Make

1. Prostrate cancer
It's an easy misspelling to make, just add an extra "r" and prostate cancer becomes "prostrate" cancer which would translate to "cancer of lying face down on the ground." Both the Centers for Disease Control and Prevention (CDC) and the Mayo Clinic websites include this misspelling.

2. First-come, first-serve
This would suggest that the first person to arrive has to serve all of the others. The actual phrase is "first-come, first-served" to indicate that the participants will be served in the order in which they arrived. Both Harvard and Yale got this one wrong.