I have had the front wheel come up several times.  Usually in first gear from a stop I'll gun it trying to break the back tire loose and it will hook up launching the front wheel.  I never have had the nads to try to keep it up and shift through the gears.  Never have tried 'clutching' it either.  With a passenger on the back the front wheel comes up very, very easily.  I (or should I say my wife) found that out the hard way.