I never knew I needed this in my life

Shh don't let them know

I want one that reads "Be careful, I'm silently judging you on your grammar."

"I am silently enjoying a cartoon for little girls."

If it's a friend I will correct them out loud..

I will awkwardly whisper grammar corrections in the middle of conversations.
Usually when I'm eavesdropping...

my French teacher has this mug...