Light bulb joke

 Q. How many people does it take to change a light bulb at Old Trafford?

A. One person to change the light bulb, one person to tap irritatingly on a watch whilst chewing gum like a mad man, several thousand people to watch on in silence and several million people to bang on about how well the light bulb was changed and how no one else could do it as well as "their person" did despite not seeing the light bulb being changed.