So this happen back when i was in 5th grade  (man school sucks ass -3-) and my teacher asked us "whats 9+10=?". So all the kids in the class said  19 (which its right) but past me (who kinda jokes around in class sometimes) said 21 (CUZ IT WAS A JOKE) and this happen 

teacher : "ok you little shit whats 9+10?" (jk she was nice) 

all the kids: "19"

teacher : "no you dumb shit"

all the kids : NANI 

past me:  21 

kid sitting next to me : BOI IF YOU GET-

teacher: yes 

all the kids: WHAT 

past me: lol 

you may think "thats bullshit" but this really happen lol