I remember playing bridge with my grandmother back when I was just learning. I opened a fairly weak 1♠ and she bid 6♠ without hesitation. We had 33 HCP, but unfortunately were missing the AK♠. They split even and we made it. One of the first slams I ever played. I swear I avoided slams for a year after that because I was petrified of having our missing points all in the trump suit :-)
Just recently I bid 7NT for the first time.
http://tinyurl.com/klksl9
I had played 7NT before but never bid it. I've always chicken out and leave it at 6.