Friends reruns

Why is friends the only show that you can watch over and over again without ever getting bored? I think i must have seen every series at least 5 times each, and im pretty sure i could watch each series at least 5 more times. Not only that, but Friends is probably the only series that is actually acceptable to watch reruns. They are eternally funny, and i cant imagine ever getting bored of it. And guess where im going? To watch more friends reruns :) ooh and its the episode where Ross and Rachel go on a 'break'!