Mental Institution

A visitor to a mental institution asked the director how he decided which pateints should be kept in.
the director said "well it's simple, we fill up a bath, then offer the patient a teaspoon,
a bucket and a teacup then ask them to empty the bath."
"ahh" the visitor said, "i see, so a normal person would choose a bucket then because its the biggest"
the director said "no, a normal person would take the plug out, erm would you like a bed by the window?"