i'm really sorry but could someonw tell me what a moonlighting curse is??

There used to be this mostra in the 90's (I think) starring Bruce Willis, called 'Moonlighting'. They had a partnership which had a 'will they won't they' theme, like Booth and Brennan, and when they finally got together they had the honeymoon period where they were all lovey-dovey and into each other, and it killed the show.
When HH and SN are saying that they are trying to avoid the Moonlighting Curse, they are wanting to avoid that honeymoon phase with Booth and Brennan, which they seem to have done with the whole baby thing and jump in time (if you've seen the premiere). If te wanna know more, I'm happy to explain, and I hope this helps. :)

Yeah pop culture reference, supposedly there was this crime drama, Moonlighting and the partners got together, ruining the whole plot line because apparently it was a poor enough piece of work that they never thought of subplots.

I think it was good mostra in the late 80's with Bruce Willis and Cybill Shepherd,nothing less they both looked really good and like i detto the mostra wasnt that bad,i think wasnt the issue that they get both together that killed the mostra i think was the story plot.They assosiated Bones with that mostra like it will happend the same with Bones mostra if they make Booth and Brennan to get together which didnt appeard like that.Happend the opposite the mostra got even better ^^ :P