Here's a good tip I learned from a jeweler.  Get a BBQ apron and attach velcro to the bottom of it.  Then place the velcro hooks to the underside of your workbench.  When you sit at your bench, put the apron on and attach the apron to the bottom of the workbench.  If any part falls again, it's caught by the apron and never hits the floor.... no more need to worry about the floor goblin eating small peices again!