There used to be an entirely average TV program called Ask the Family (which has been axed according to this very informative website) hosted by that famous comb-over Robert Robertson. Not the Nine O'Clock News did a skit on it where the families were all chartered surveyors. One round of the program was close up photographs of everyday items and you had to guess what the item was.
So here's mine. The difference here is that you're not on TV, I don't care whether you guess it and it's not a close up. It is very famous though.

Read on to see if you were right...
It's the clock at Waterloo under which thousands of people have arranged to meet at one time or another.
Posted by grahame at December 10, 2003 08:44 PM | TrackBacki hope they were more definate in their rendezvous than your suggestion:
"where shall we meet"
"under the clock at waterloo"
"when?"
"one time or another"
"ok"