Sorry cannot quote. Scary is relative. If you want scary extend the speedbrakes a few degrees to stop the float (not recommended). Of course I am certain nobody has done this, or landed with the flap load relief operating. These things never happen to us, only others far far away.
PPL? Too old to remember, however I seem to remember a discussion about instead of retracting the flaps after landing some people retracted the gear instead. Maybe that was the reason they didn't teach that.