I joined the herd during the month of September in 2014; here are a few examples of what I believe a Brony shouldn't say.  And this is just Round One!   

-- Featured in: http://www.bronyland.com/funnies/ 

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Featured Animation
Littleshy FiM youtube.com/user/LittleshyFiM 
-Rainbow Dash: Rainy Brony youtube.com/user/RainyBrony
- quicheOUouiche: http://www.youtube.com/user/quicheOUo 

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Pokemon video games belong to Nintendo

Featured Music:
"Can-Can" by Offenbach
"Neon Storn" by Jingle Punks