Many years ago I was fortunate (or unfortunate[?]) enough to find myself with access to a brand new C150 Aerobat. Having completed a basic aerobatic endorsement in that aeroplane I decided to teach myself snap rolls - so off I went, climbed to a "safe" height with Aerobat in one hand and Cessna POH in the other, opened at the section on snap rolls.
Pre-aerobatic checks complete, I initiated a by-the-book snap roll entry ..................... and the world as I knew it went beserk!
I recovered from the spin after several turns and many hundreds of feet below where I had started!
So much for snap rolls - I resolved there and then to never do that again!
Dr 
PS:Several years later I was somewhat surprised to see little brackets strengthening the tail of the C150A - the result of a mandatory AD.