"Nothing could possibly go wrong!"

Prerequisites: Nothing explicit, but I'd recommend watching this paired with the other 50th Anniversary episodes.

Spoilers!
The Last Day isn't a bad minisode, but it is admittedly very short and fairly cheap. The ideas are cool; I like the concept of these 'premonitions', and the headcam perspective was novel. The ending, while predictable, is effective, and it all makes for a fairly decent introduction to The Day of the Doctor.