July 10, 2014 10:56 AM EDT

Many celebrities shoot for humor when they first join Twitter. But not Kelsey Grammer. On June 30, the actor signed up for Twitter with a very different goal in mind: to correct everybody’s grammar.

You’re probably thinking, Oh, he’s only doing this because his last name is Grammer or whatever. But the actor, best known for playing Dr. Frasier Crane on both Cheers and Frasier, is actually a rather convincing and aggressive pedant. He’s still going strong, correcting individual tweets as well as offering more general grammar lessons. He keeps things organized using the hashtag #KelseyGrammerGrammar.

Grammer isn’t afraid to call out more high-profile offenders, too:

Keep on fighting the good fight, Frasier.

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