At work, Penny casually drops the kind of news that instantly changes the room: she is going to meet Bill Gates. Leonard freezes, half amazed and half wounded, while the others tease him about how this could be “the end” of his good run with her. Penny explains that Gates will arrive on Sunday and that she will give him a tour of the labs and offices on Monday morning. The detail about April first sparks suspicion, and the whole conversation slips into the playful confusion of April Fool’s Day. Still, Penny insists she is serious, and Leonard tries to act supportive, even while clearly wishing he could be part of the moment.