Speaking of which -
In my college days I got a bit of dual in a WWII PT-22 trainer that had a bit of sweepback in the wing. We did slow flight, stalls, the usual training exercises.
Then my instructor (Prof. Irwin Treager, author of the powerplants text) said "try a stall approach with a little cross-control". I did, approaching power-off stall very carefully, when suddenly we did a snap roll!
So fast, we had rolled 360 before I had time to think, let alone recover.
The lesson was obvious; keep up your airspeed in a slip!