Just today I was the setting all the equipment for my 125 aquarium project back up (finally put in the new substrate and some of the new, real non-fake decor yay) and it has dual canister filters. But I messed up and put the tubing outlets on the wrong ends (output and input were switched) so they weren't priming properly. And in a horrendous move, instead of just switching out the pieces on the ends, I stupidly unscrewed one of the tubings off the canister which meant water got everywhere and my poor mother had to help with the mess while I had a giant self-esteem episode from the mistake. Sigh...