Tennis fan: hi Federer and Nadal! I have tennis rackets and balls, do you want to play?
Tennis fan: here there are many tennis courts, I would love to see you guys hit some balls
Federer: oh there's no roof?
Tennis fan: a roof? Why it's a beautiful day, this is a summer sport, why a roof?
Federer: you know, when you are playing Rafa, till he is done with butt picks, time violations and fake injury time outs it will be dark alerady, in worst scenario it mighty start new seasonal period and start to snow, you know i have kids and they will be asking my wife why daddy is growing a beard and losing hair on TV
Tennis fan: ???