Monty Python's Flying Circus, Series 4

Second Store Assistant:
So, sir, that is, if I may say so, 184 pounds 1 and 1/2p, sir.

Chris:
Oh, will you take a check?

Second Store Assistant:
Ah yes sir, if you don't mind leaving a blood sample, and uh, a piece of skin off the back of the scalp, just here sir. Sorry, it's just for identification, you know, can't be too careful.

Chris:
I think I'll put it on account.

Second Store Assistant:
I should think so, much less painful.