They just need to make two of the same emote (like the posing ranger emotes) and have it so they go together if timed properly. Not that complicated really.
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Why couldnt the dance emote only be good if you are in party with the person. I've seen tons of balls (dances I know how trolls can be) being thrown. This would be a welcomed addition. Hell even if you had to get married to get this which would mean more revnue for SE players would do it and those married can just do a quest.
Could be as easy as two players performing the same dance will automatically dance together if within a certain distance to each other. They could also put restrictions similar to triple triad and duels to prevent players from dancing together in certain areas and under certain conditions. The only major constraint I see is creating new animations, but all the people dancing on the event stage at the MGS would be surreal!
OMG YES PLEASE! I absolutely support this and would love couples dances such as Waltz to the Moon.