Who teaches him these things! Before I gave birth to a boy I really thought some of the things boys did were learned. NOW, I am pretty sure some things are inborn, and have to be trained out of them.
For instance, putting an empty milk carton back into the fridge. This has happened twice this summer...Tobie and I do not do this, he has not seen his grandparents do this...thus inborn right.
Another for instance, is he can't find ANYTHING! Even if he is standing over it....sigh