I've always thought it would be hilarious for monster's aggression to be somewhat related to emotes. It was commonplace in XI for example for people to use /slap on particularly annoying monsters (because they were in the way or something) and I always thought it would be reallllly funny if the monster picked up on the slap and charged at the person who used the emote.

In XIV we have a lot of emotes that could work well like /beckon for example.