Do you like ice-cream? London sellers offer you a very unusual opportunity: now you can try different kinds of tasty ice-cream the only "obstacle" you will have to overcome is ...Thames:) The problem is that the seller is boating with that ice-cream but he does not reach the bank so in order to buy something you'll have to come into the water at least till your waist-level. Would you try?:)
I also like ice-cream very much but I wouldn't come into Thames (especially till the waist-level!) to try it because Thames is a very polluted river. I think it's better to buy some ice-cream in a shop.
To tell the truth I like ice-cream very much. May be it sounds strange but I wouldn't say no to this unusual way to try different kinds of tasty ice-cream!)