I heard this one lady say that she is a born again Christian and when asked what was her faith before she said 'Catholic'.
I remember another time a lady asked me where was the nearest church (in a small resort town) and I started by saying, 'well there is the catholic church down there' and before i could mention the other 2 denominations near by, she said 'oh no no, I am Christian' but didn't see any irony in what she had just said.