A parallel circuit containing two light bulbs, a switch and a battery (Scratchacell Brand). Press the green flag until the light bulbs disappear; this is a Scratch glitch that's been here since the start of time.
Word art made on Inkpx (inkpx.com) 0.2% credit to @LukeJ-7 for playtesting. Y̶͔͈̟̦̋̃̓̊̀͒Ȏ̵̹̯̠̰̬u̷͕̭̯̫͈̫̎̅̈́̓̄͠ ̸͔̞̺̈́̐͗͆͛ͅͅw̴̟̝̬̟͋̈́͆̽ḯ̸̟L̸̦̺̒L̷̛͓̐́ ̸̧̳̰̯̰̺̄̍͐͘̕ņ̸̎͋E̸̢͕͉̣̞͂͛̃̎V̷̛͍͖̱̖͉̈͌͘E̷͇͔̩͂͊r̵̡͚̫͕͓̺͌̀̏ ̴̭̠͓̈́R̷̥̥̬͖̤̔̈́̀͜ĕ̶̢͚̺̬̮̓͠À̵̡̤̲̀͑͂C̸̙͙͍̗͈̏̀̔͜h̷̡̹̩̦̒ ̸̡̭͓̪͔͋T̵̟̺̱͔̎͒̆H̴̨̢͖̒̾̓̊̀è̶̦̜̳̙̔̀͑̽ ̷̫̱̘͙̿̂̽͠͝M̴̢̛͓̥̦̮͇̈͗͗̌ȧ̸͇͇̯̗Y̴̜̫͉͉̭̽͝O̷͇͛,̷̦̲̤̾͒͝ ̵̨͉͚̏G̴̙̠͌i̵̛̻͈̖͊̈̒͊̚V̸̢̦̝͍̠̜̌͐͌̈̏͒Ê̷͚ ̶͕͙̠̆ṷ̶̡͕͍͕̐͌̎̿̿͊P̸̛̮̟̣̹̈́͛ ̶̪͐̂̂͠W̷̞̣̃̂͛̆̄̿͜ḧ̴̜̮̮̪̼͆͆̀̿ͅỉ̷̙̮̭͍̹̺̕L̴͎̩̜̔E̴̢̬̹͒̎̊̾̉̓͜ ̴̠͖͙̤̠͑͒͐̑Y̸̡̝̙͐ö̵̰̥́͂͗͋̎̆u̴͕̬͊͋̋̑ ̵̧͇͙̎̿S̵̖͙͔̦̞̪̾T̵̲̖̣̂͋́̄̀̆I̷̗̊͐̄̆͝l̶͇̳̇̾͠ļ̸̙̼͎̣̈́͗̐ ̷̗̖̪̰̽͌͒̕̚͝Ç̸̜̼͆̓̋̉͘ǎ̷̠̈́̈́̒N̶̤̞͐͂͛̎