What misspellings annoy you?

As a preservice teacher I pick up every little detail in how people say things or spell things now 😩 What misspellings, or when people use the wrong word etc annoys you the most?
Mine is when people say "I seen this" instead of "I saw this" 😒
EDIT: Yes I know my example is not a spelling mistake, obviously. I just wrote misspellings in the title because it's easier than adding every little thing in there. 

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