We all have that one friend (or know that one person) who thinks they are so smart they can say "I know" to everything without even listening to what your trying to say.
Example-

Me- "Omg I'm so ugly"

Person- "I know"

Me- "you're so fat"

Person- "I know"

Me- "and your really dumb and mean and you don't care about people"

Person- "I know"

Me- "did you know cats have 9 lives?"

"I know"

"Did you see that one commercial..."

"I know"