I love all the epsiodes but i like nightmare night just because of this line made me laugh so hard:
Twilight Sparkle - You`re a genius
Pinkie Pie - No, I`m not. I`m a chiken
Also the discord episodes because the quote
Fluttershy: What's wet and clueless... YOUR FACE! *slams the bucket on twilights head*
I've never laughed so much then seeing that!