"Boarding-House Geometry", by Stephen Leacock (1869–1944), can be found in his book Literary Lapses. You may recognise that this essay is based on the definitions and postulates of Euclidian geometry.
All boarding-houses are the same boarding-house.
Boarders in the same boarding-house and on the same flat are equal to one another.
A single room is that which has no parts and no magnitude.
The landlady of a boarding-house is a parallelogram—that is, an oblong angular figure, which cannot be described, but which is equal to anything.
A wrangle is the disinclination of two boarders to each other that meet together but are not in the same line.
All the other rooms being taken, a single room is said to be a double room.
A pie may be produced any number of times.
The landlady can be reduced to her lowest terms by a series of propositions.
A bee-line may be made from any boarding-house to any other boarding-house.
The clothes of a boarding-house bed, though produced ever so far both ways, will not meet.
Any two meals at a boarding-house are together less than two square meals.
If from the opposite ends of a boarding-house a line be drawn passing through all the rooms in turn, then the stovepipe which warms the boarders will lie within that line.
On the same bill and on the same side of it, there should note be two charges for the same thing.
If there be two boarders on the same flat, and the amount of side of the one be equal to the amount of side of the other, each to each, and the wrangle between one boarder and the landlady be equal to the wrangle between the landlady and the other, then shall the weekly bills of the two boarders be equal also, each to each.
For if not, let one bill be the greater.
Then the other bill is less than it might have been—which is absurd.
Also from the same book is The Force of Statistics. Also by Stephen Leacock are Mathematics for Golfers and The Mathematics of the Lost Chord.
More mathematics humour.