Joe Perham, my favorite Maine humorist.* At least I think he's the one I heard it from.
Posted by olvlzl.
My uncle went to Chicago by train and took a berth in the sleeper car. In the middle of the night the lady in the berth above said,
“Mr. it’s awful cold. Could you go get me another blanket?”
My uncle said, “ I’ve got a better idea, why don’t we pretend we’re man and wife.”
“Well, that could be interesting,” the lady said.
“Good, go get your own blanket.”
* I just found his site, no guarantees of its content is offered or promised. Though he is pretty funny.