This article is from the rec.food.drink.beer FAQ, by John Lock with numerous contributions by others.
This is a very old, very tired beer joke attributed to Monty Python.
I'll spell it out for you:
Q: Why is making love in a canoe like drinking American beer?
A: Because they are both fucking close to water!
But don't ever repeat this on the Net or the following will occur:
1. You will be scorched to a crunchy black by some excruciatingly
creative individuals.
2. You will receive a number of "corrective" e-mails.
3. Your family/relatives will be visited by "Guido", a large,
ill-tempered man with hairy knuckles.
...in that order!
 
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