A man and his wife live in a row house where all of the houses look alike.
Every time the husband goes to the pub, he returns to the wrong house and disturbs the neighbors.
To fix the problem the man puts a lantern on his porch to show which one is 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 is 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!”