This new infinite 1-Up trick has really surprised me. One more discovery of the classic Super Mario Bros.
It should be harder than it looks. Very precise inputs are necessary, otherwise Mario would easily fail pretty quickly.
Special thanks to RedLuigi75 for the inspiration.
PS: L+R isn't required. I don't find it possible to do this without TASing. 8-2 is so far the only place I find possible to perform this trick (without 2nd quest).