It's the one where they're all standing at the bus stop in the rain and the the bloke swans out in his shorts because he's checked the weather.
As he walks past the people at the bus stop and they all look at him, the girl with the lanky hair sticks her head forward and ... well, what's she doing, exactly? Looks as though she's sniffing him. Seems a bit perverse but what else could she be doing?