Simon:
Oh God, no, no don’t kill me. I’m not a spy. I’m nothing. I’m navel lint. I have to lie to women to get laid, and I don’t score much. I got a little dick, it’s pathetic.Wha, uh, oh God. Would a spy pee himself, huh? Please, I’m not worth a bullet.
Doctor: He stood in front of the Untempered Schism. It’s a gap in the fabric of reality through which could be seen the whole of the vortex. We stand there, eight years old, staring at the raw power of Time and Space, just a child. Some would be inspired. Some would run away. And some would go mad.
Martha: What about you?
Doctor: Oh, the one that ran away! Never stopped.
OK, so he didn’t exactly pee on himself that we know of, but it was a nice change from all the “Oncoming Storm” and “Destroyer of Worlds” stuff.
The first thing that came to my mind when I read your title was some dialog from an old movie I saw in my early teens. Yellowneck (1955) was a low-budget film that nevertheless has stuck with me for over 50 years. I couldn’t find the text of the passage I remembered, but fortunately YouTube provides the entire movie in 10 sections if any of you want to watch it all. The portion I remember that fits this thread’s concept starts at about 3:20 in Yellowneck 9/10 (1955) and continues for most of the rest of the clip.
Brave Sir Robin ran away.
Bravely ran away, away!
When danger reared its ugly head,
He bravely turned his tail and fled.
Yes, brave Sir Robin turned about
And gallantly he chickened out.
Bravely taking to his feet
He beat a very brave retreat,
Bravest of the brave, Sir Robin!
ARTHUR: Well, we’ll not risk another frontal assault. That rabbit’s dynamite.
ROBIN: Would it help to confuse him if we ran away more?