I have. Yesterday, I was playing Super Monkey Ball 1 on expert mode. I got to stage 42 without using a continue. I wanted to warp via the red goal, and after falling two or three times (I only had 1 life left by the time I made it), I finally got to it and it let me warp to stage 45, THE EXACT SAME STAGE I WAS HOPING TO AVOID WHEN I USED THAT WARP. That convinced me I needed a break from trying to 100% expert mode in that game (which requires you to beat the main stages without using a continue, then beat Expert Extra without using a continue).