Why Ask?

I was out last night, playing poker with the boys as I have done for the last 10 years and, just 10 minutes ago, whilst eating my full English, my wife (that would be Mrs Angry) has just asked me what time I got in last night. "Oh I don't know, bout 00.45" She said "No you didn't, it was gone 4am before you came in"
This makes my blood boil......if you know the answer to a question before you ask it, why ask it anyway?

Mr. Angry