gdiphil, you can have my seat on Rainboe's flight!
Aged 14 in a Vickers Viscount from Salisbury (as Harare was then) to JNB. Through a thunderstorm at FL 160. Many adults were ill and it was the most unpleasant and disturbing sector of my life. That was some 38 years ago and I have not forgotten.
Yaay for weather rader and nice jet engines to climb higher, even though I have, of course, also been bumped around over the tropics at Fl 360 (again going to JNB, this time in a 741 from LHR) and it was not fun.