Searching old logbooks,we had some twenty hrs unusual attitudes with C150 Bat.-Most of them probably self-induced...-But at least it wasn`t a scare when blue turned to brown,or contra. Some were flown "bagged",as someone described it so well. I am a bit surprised to read that such training is not included in initial training syllabus,for some airlines. Be it even 150,turning it upside down gives You much confidence of how to handle an airplane. Nowadays they seem to have an Extra 300 just for that purpose.