Fluffy Care Rule #248: Do not shout threats or put-downs (even if you don’t mean it) at a fluffy (adult or foal), because they’ll believe every word you say.  
Threats will make a fluffy start bawling, covering his face with his hooves while cowering and crying in fear of getting hurt, saying he’s a good fluffy and will always fearfully anticipate “huwties or they’ll start thinking they’ve done something wrong and try to get out of what they think will be a violent vicious beating.  
Put-downs will not really effect the fluffy at first if he thinks you’re joking, but if you’re serious, he’ll instantly start crying and thinks that he is a bad fluffy and starts trying to hurt or even kill itself, mainly by trying to get you or another human to give him “biggest huwties” or “fowevah sweepies”.  
When a fluffy finds out he’s been duped (if he finds out he’s been duped), he won’t really care, but some of the more emotional ones will be mad at you for a while (a while usually translates to about a half hour to three hours) before he stupidly, but happily forgets your hurtful words and starts loving you again.

I WILL CRUSH YOU WITH THE FORCE OF A THOUSAND SUNS–  
 
Oh you’re so silly!