Back when I was flying serious competition aerobatics there were some common figures relevant to this discussion.
(been a long time so please forgive any errors in the following details)
Enter an inverted spin from upright. Set it up initially as you would for an upright spin and earlier than normal - full forward stick, full rudder and full opposite aileron. Centralize the aileron once it was spinning. Pretty uncomfortable if aileron is not used initially to get some roll into it.
On occasion we'd also get negative flick rolls from horizontal upright flight.