I would, unfortunately, smile and pay.
There was one instance where I really cursed myself for being honest. I was on the concourse of Victoria station and was walking behind this man and his ladyfriend. The man opened his wallet and out came a bundle of £20 notes which fluttered to the ground. The man was totally oblivious. Without even pausing to think I said 'excuse me, mate, you've dropped some money'. The man turned round, gave me a filthy look(!) and grabbed the notes, then walked off, tutting.
He didn't even say thankyou.
There was one instance where I really cursed myself for being honest. I was on the concourse of Victoria station and was walking behind this man and his ladyfriend. The man opened his wallet and out came a bundle of £20 notes which fluttered to the ground. The man was totally oblivious. Without even pausing to think I said 'excuse me, mate, you've dropped some money'. The man turned round, gave me a filthy look(!) and grabbed the notes, then walked off, tutting.
He didn't even say thankyou.