Recently when I went to Aldi for a bit of shopping (organic spuds and some basic cheese), there was a woman about to return her trolley to the trolley rank so I offered her a pound coin to save her the trouble. She took the coin and scarpered before I realised that the trolley didn't have a coin in it. She had made a £1 profit and my shopping cost me £1 more than necessary - so now I don't trust Aldi customers and I'm off to Waitrose for a free cup of coffee to make up for it.