Person swapping social experiment by Derren Brown.

[ChrisGreaves]

wimp.com

Well Duh! me.
Took me a while to work out what was going on.
but then I'm gullible ...

[HansV]

Great!

[ABabeNChrist]

Now that is funny stuff
I couldn’t believe to what extreme they went too and most didn’t have a clue.
It goes to show how observant we can really be

[HansV]

People usually concentrate on one task - in this example looking at the map and showing somebody the way. Our brain filters out most of the rest.

See also this older thread: Follow-up to the "Invisible Gorilla" video.

[ABabeNChrist]

I see what you mean

[ChrisGreaves]

Great!

Thanks Stuart.

Spoiler

What did you do with Hans?

[StuartR]

Great!

Thanks Stuart.

Spoiler

What did you do with Hans?

That was very observant of you Chris, most people miss that one!

[ChrisGreaves]

Great!

Thanks Stuart.

Spoiler

What did you do with Hans?

That was very observant of you Chris, most people miss that one!

Yeah, well I'm glad BobH caught it!

[ChrisGreaves]

I see what you mean

*I* thought that the joke was that he was standing right outside Trinity Church!