have forgot to slide the stop off the tube, and proceeded to tie up the rest of my float rig....and then realize crap...i've gotta cut it and start over.
Friend of mine only goes fishing with me about twice a year, and he's notorious for sliding the float on upside down, and doesn't realize it until he goes to cast, and then you'll hear him swearing and reaching for the clippers to cut it and re-rig.