Kicking off the list is a deleted scene from the 2013 Christmas Special, The Time of the Doctor, in which Clara Oswald gets a few home truths about Christmas off her chest before embracing the Eleventh Doctor in a good old fashioned naked hug.
In case you'd blocked that particular part of the episode out, the titular Time Lord was wearing holographic clothes at this point (no, seriously!) and this short but sweet exchange would've been a nice bit of lighthearted fluff to prepare us for what soon escalated into one of the most depressing Doctor Who episodes of all time.
It didn't really add anything to the overriding plot, though (which was already chockablock to say the very least), apart from affirming that Clara is most probably the biggest Scrooge ever which fans had already guessed anyway from her disgruntled facial expressions during Christmas dinner.
The scene was exclusively revealed online shortly after the episode's prepare and you'd have to be mad to turn down the opportunity to see more Doctor Who, even if it is just 34 seconds of it.