A tweet defining Covfefe's Law: when a reply inadvertently proves the OP's observation about a group.

A screenshot of a tweet from Covfefe Anon defining 'Covfefe's Law', which states that when an observation is made about a group, a member of that group will reply in a way that proves the observation true.

Covfefe Anon @CovfefeAnon · May 13 Covfefe's Law - if an OP is some observation about a group someone will show up in the replies to argue against the point being made in the OP in such a way that demonstrates the truth of the observation (almost always happens with women)