Well wedding is obviously one and the musical episode is another. Death Black Fairy is one, maybe Tiger Lily as well.
I think OUAT will fall into the following:
–Weddings (duh, lol)
–Fatalities (Black Fairy, and maybe Rumple)
–Characters leaving town (Snow White, Prince Charming, possibly Belle and Rumple)
–Number of time warps (maaaaybe)
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"He was a lot of things to me" "The only conclusion was love"