I know you not laughing - The 5 words that come from someone who’s too proud to admit

The 5 words that come from someone who’s too proud to admit they’re laughing at you.

My teacher laughed at my silly answer. 'I know you not laughing.'

My brother snickered when I tripped in front of everyone. 'I know you not laughing.'

My dad chuckled when I tried to do a magic trick. 'I know you not laughing.'