Actually, this one was me
Boarding an Easyjet flight to Amsterdam, I unexpectedly saw a friend of mine taking her seat a few rows back.

"Blimey, Mia, what a surprise seeing you here? Where are you off to?"

"Amsterdam..."

About five rows of people simultaneously muttered the word "twat" under their breath. They had a point...
(Rakky (forgot her password) The muffin maverick, Thu 25 Mar 2010, 8:39, 8 replies)

They did.
*belms*
( disasterprone "Pyjamas caused the Holocaust", Thu 25 Mar 2010, 8:43, closed)

Don't worry, you're not alone :)
I got into a taxi once and saw an old school mate:

"Hello mate, what are you up to these days?"
"Er... driving a taxi"

*spang*
(Professor Kenny Martin Hmm? What?, Thu 25 Mar 2010, 9:04, closed)

Oddly enough, a very similar thing happened to me.
A police car drew up beside me. I resisted the urge to leg it (old habits die hard), was beckoned over and discovered a beefy copper inside. He greeted me, I asked what he was up to.
( disasterprone "Pyjamas caused the Holocaust", Thu 25 Mar 2010, 9:34, closed)

It's not that unreasonable a question
I've flown to Amsterdam a few times, but it was never my final destination
(An Alien sneezed on Bill Oddies binoculars, Thu 25 Mar 2010, 9:22, closed)

S'right,
Amsterdam's a major hub. 90% of the time I'm there I'll just be passing through.
( Fronds are waving gently on, Thu 25 Mar 2010, 10:27, closed)

Although
if you are passing through, it's unlikely you'd be on an EasyJet flight, unless you've booked separate flights rather than a two-leg one.
( K2k6 has a proper job these days, Thu 25 Mar 2010, 12:13, closed)

Supermarket
I see someone I know and they come up and say "What are you doing here?"

"Uh, shopping?"
(oneinthepink is at your cervix m'lady, Thu 25 Mar 2010, 9:37, closed)

hols
I went on holiday to amsterdam once and came back with a t-shirt with a big dutch flag on it and "amsterdam" written underneath. What can i say, i was kind of stoned.
Anyway, I bumped into a friend who remarked on the t-shirt. "yeah I got it on hoiday" I said.
"Oh, where did you go?"
(unciebana It's good, but it's not right., Thu 25 Mar 2010, 10:48, closed)