WATCH: Sofia Vergara Slaps Jimmy Kimmel!

As Jimmy Kimmel points out before this bit, "No sane person would ever say the kind of things that they write online to someone face-to-face. If you did, you'd get killed." The late-night host then attempts to test that theory by reading mean messages to Modern Family vixen Sofia Vergara.

"If only Sofia Vergara was a mute," Kimmel, 46, reads. "Her voice rings in my ears."

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Vergara, 41, also got in on the act, reading back mean comments to Kimmel. "I have never liked Kimmel and I still don't," she recites. "He's such an unfunny creep."

These are the tame messages compared to others. Check out the video to see the comment that gets Kimmel slapped!