There's the rub...

A postgraduate student, a postdoc and a professor find an antique oil lamp. They rub it and a genie emerges in a puff of smoke. The genie says: "I usually grant only three wishes, so I'll give each of you just one." "Me first! Me first!" says the postgrad. "I want to be on a yacht in the Bahamas with a beautiful woman." Poof! He's gone. "Me next! Me next!" says the postdoc. "I want to be in the Seychelles, relaxing on the beach and drinking cocktails with a gorgeous man." Poof! She's gone. "Now you," the genie says to the professor. He replies: "I want those guys back in the lab after lunch."