There are people at my school who play Yu-Gi-Oh the wrong way.
-They include Fusion monsters in the normal deck
-They don't Summon Fusion Monsters correctly
-They think you can still Normal Summon if you Set a monster
-They're still in the primitive "You can Normal Summon without tribute"
-They think Branch! lets you Special Summon a Fusion Monster from your hand
-They also think Soul Exchange lets you Tribute any number of monsters on your opponent's side of the field, but they have to give the oponent a monster. VERY ABUSABLE!
They said I was a nerd when I said they weren't dueling right as well. D:
Discuss any similar encounters you have had.