I'll never tug on Superman's cape, spit into the wind, pull the mask off that old Lone ranger, and I'll never mess around with Slim.
Ski thru a revolving door.
Sky dive. Just going on an airplane is risky enough these days lol.
Besides Skydiving, and some other things, it is hard to say for sure as when I'll say I never do something, as nothing can be 100% for sure, as unexpected things can happen.