Ouija for 11-Year olds?

[Undertoad]

Probability combined with cause and effect. The fact that you or anybody dowsed over that area and there happened to be a pipe there are unconnected. The fact that there was a pipe there makes you believe you found it; but some percentage of the time there would be a pipe, even if a Cellar monkey just picked a random location.

There are other possible explanations, such as:
-- somebody played a trick on you and you didn't know it;
-- you subconsciously knew where the pipe was; perhaps you heard rushing water but didn't connect it to drainage;
-- you subconsciously picked a good location for a pipe (in the middle of the house, not by the side where there are no bathrooms, etc);
-- explanations that we don't know, can't think of offhand, but are credible;
-- or, dowsing works in some individuals, and somehow all of humanity through all of time has not yet worked out how, and why it can't be reproduced and tested-for under controlled conditions. I would say that's very improbable. But there's a chance, so we have to list it.