yourScrollPane.getVerticalScrollBar().setUnitIncrement(85);

It's actually pretty simple. Just do something like this, adjusting to the horizontal scrollbar and/or the height that you want:

yourScrollPcane.getVerticalScrollBar().setPreferredSize(new Dimension(85, Integer.MAX_VALUE));

Train your reflexes. Beat your friends. Be a ninja :)

Warning: possible side effects might include utter disappointment in software developers for all time.

For downloading my dumb-as-shit fortune cookie android app :)