Tooth Fairy Trauma

Let me preface this story with a story. We have talked to Alex about the tooth fairy and all that she entails. I said she does have an arrangement that she will let you keep your first tooth if you would like. He said no she could have it.
Last night the tooth fairy came but it was not without some trauma. At about 3:30 am Alex comes in our room bawling. I ask him what is wrong and he says he wants his tooth back. I asked him why and he said, "Cuz it is special." I realized he was not quite awake but asked if she had come. He said yes. I followed that with how much did she leave you. "A quarter", he says. I then tell him to go back to bed and we would work something out.
In the morning he comes in and says it was not a quarter but two gold dollars. He said I thought she would bring actual dollars. I had to explain that that was what that was. He was then really excited about it. He still wants his tooth back though.