The two women are just hanging out having some snacks.  This guy they think is creepy starts walking up from behind and the lady who sees him tells the other one not to look up because he is coming.  He thinks he is funny and tries to sneak up on the one with her back to him, but he is actually just annoying.  He always takes jokes too far and is "that guy" who ruins the mood at a party by doing something stupid.  He thinks he is cool, and if he scares this girl she will really like him because he is always just having fun and joking around.  He ends up running up and trying to scare her, but she knew he was coming.  Then he stays around for longer than he should, and they wish he would leave.  The one woman wants to call her husband to come outside but cell phones weren't invented then.
