Sort-of memes that are cracking you up at the moment

^Indeed. Reminds me of the old joke

• How do you know if somebody's read the book before they saw the film? Oh no need to ask, they'll fucking tell you.
  
  

You can of course replace 'read the book before they saw the film' with 'Vegan'.

The variation I've heard of that is "how do you know if a vegan is at a party? Don't worry, they'll tell you."