Also, remember that the Intentional Drop rule is moot in Infield Fly situations. This is because the Infield Fly Rule takes precedence; that is,
IT is invoked first, rendering the Intentional Drop moot. Of course, there's an exception to this exception: the Intentional Drop can still be invoked with runners on first and second or bases loaded if an infielder intentionally drops a line drive or bunted ball, because the Infield Fly isn't declared in such situations.
Confusing enough?