Another Cow joke I attribute to my 'Ol chemestry prof was the placement of
a cow onto the roof.  I would presume a fairly storng roof, but once up
there it would be hard to hide the fact to the cow that any direction would
be down.

Another pratical joke involved the use of outhouses.  Once the target has
established himself you take up the slack on the attached rope which has
been measured to set up tremendious harmonics in the structure.  When the
rope transfers your strumming to the outhouse, it usually falls apart with
a most revieling nature..