Janis Joplin T-shirt

Before Janis died, she made provision in her will for a party for her friends. After she died, her closest friends held that party, with a banner at the door that said: "Drinks are on Pearl!”. I would like to do the same sort of thing, but unless you buy buy a T-shirt the sign is more likely to read “Half a lager and a packet of pork scratchings, so you better be quick”