Lost In Fog

Three guys are in a plane, lost in fog, and they don't know where they are. The first guy says:

- I'll find out

and puts his arm out the plane, then brings it back in and says:

- We're just over Paris

- How do you know - ask the others.

- Well I've just felt the top of the Eiffel tower.

Later on the second guy tries and says:

- We just flew over London

- How? - asks the others.

- Well I've just felt the top of Big Ben

Still later on the last guy tries it, puts his arm out the plane, and says to the others:

- We have just flown over Glasgow.

- How do you know that? - comes the reply.

- Because some bastard has just stolen my watch