Just so long as the end of your dipstick doesn't fall off . . .

But seriously, you want the oil level between the under and overfill lines. The danger zones are being under or over. Underfill is obvious, not enough oil to lube and cool. Too much oil and you run the risk of having your crankshaft turn the oil into a mocha latte topping when it chuns through the excess, which may sound nice, but is worse than having no oil.