Are you a retard?

Are you a retard?

1 Q1: 27+2+18-2276+6678 =? =) =P =S =D
2 Q2: ₠ <<< what’s this?
3 Q3: If your best friend is a dumbass, then what are you?
4 Q4: If Tom, Dick and Harry visited you, what would you do?
5 ''You're a jelly donut'' Who said this and to whom?
6 Q6: Are you invisible?
7 Q7: Who wrote the book ‘’the day my butt went psycho’’?