Taxed

"How have you managed to buy such a luxurious beach house while your income is so low"? asked the tax auditor.

"Well," the taxpayer answered, "while fishing last summer, I had caught a large golden fish. When I took it off the hook, the fish opened his mouth and said,

'I am a magical fish. Throw me back to the sea and I'll give you the most luxurious beach house you have ever seen.'

I threw the fish back to the sea, and got the beach house."

"How can you prove such an unbelievable story"?

"Well, you can see the beach house, can't you"?