Today is Maundy Thursday, the day when we remember the Last Supper.
Jesus and his disciples were having the traditional Passover meal, remembering another awesome moment of God, the rescuing of the Israelites from Egypt long previously. Then Jesus said "Take eat, this is my body".
Jesus was symbolising the fact that he was about to become a human and divine sacrifice for the forgiveness of our sins. This was very much his last meal before the horror of the following day.
Now, I was a Doctor Who fan before it was cool. Russell T Davies may be an atheist, but he's worked a fair number of religious metaphors into his scripts.
One scene you may well remember (in fact, you almost certainly do if you watch the show) is that scene from "The End of Time". The Time Lords have vanished and Wilf is stuck in the radiation booth. The Doctor realises that the only way he is going to stop Wilf getting a lethal dose of radiation is to go in there and take it himself.
Now, the Tenth Doctor rather likes being the Tenth Doctor and doesn't want to die. He gives an anguished, angry speech, then he sacrifices himself.
The Garden of Gethsemane is basically what was recreated (it's happened more than once in this show). Jesus, a man who makes the Guardians and the Time Lords look like Paul Daniels, wasn't happy about what he was about to go through.
But he did it. For all us poor Wilfs.