Clearly the wife was given some money to look around for purses/shoes etc.
Then when she ask how much it cost, you say ah?? not much, just a bunch of guys on a ugly card- 20 bucks.
Then you quickly change the subject- I'm hungry, where we stop? Or you need to re-fuel.
Or did you do the deed, and leave her at home???
The TRUTH will set you FREE
