A man and his wife live in a row house where all of the houses look alike. The wife tells the husband that every time he goes out he returns to the wrong house and disturbs the neighbors.

To fix the problem the man puts a lantern on his porch to remind him of his house.

So, like clockwork he goes out and gets plastered. Upon returning home he sees the lantern and says to himself "There's my house and there's the lantern I put on the porch."

Satisfied with himself he walks onto the porch and puts his key in the door, "I knew it, this my house cause my key works."

Now even more impressed with himself, he enters into the house and goes to his bedroom. Upon entering he exclaims, "I knew this was my house cause there is my wife, and there I am in bed with her!"