Has the machine received a knock of any kind?
The computer is on the table and plugged in. The screen shows lots of fuzzy lines like interference. The vicar enters followed by Del.
Vicar:- (Indicating the screen) You see what I mean Mr Trotter, I've tried everything but it simply refuses to work.
Del:- Hmm, I see. Has the machine received a knock of any kind?
Vicar:- Oh no, I can assure you.
Del now gives a heavy thump with the side of his fist. The screen clears and appears to be in working order.