The next three I wrote for this occasion. One to be sure the Texas Instrument-83 calculator has fresh batteries. One to determine which formula to use. One to change the bulb. And one to explain why it is important that you understand how you got the bulb into the socket, even if it does not come on.
Russian lightbulbs are perfect.
They never need changing. You can't find any lightbulbs that are not burnt out. One to screw it almost all the way in and the other to give it a surprising twist at the end. One to change the bulb and four to pray against the spirit of darkness. One to actually change the bulb, and nine to say how much they liked the old one.