英语作文《an amusing experience》一分钟左右

An amusing experience
I had an amusing experience last week.When I was walking past a supermarket,I watched an advertisement on it.It had only a picture with a word on it 'Inexpensive'.But I thought that it 'expensive'!I was surprised because no one had seen it before!I asked one of the shop asistants for their manager's email address and quickly back home and wrote to the manager.After I sent it,I waited for it every day.I received the email he sent back on Sunday and he told me that it was 'Inexpensive' ,not 'expensive'.I walked back there and looked at it again.Oh!My god!What a big mistake I have made!