Venkman had had enough. He was all excited to see Attack of the Ant People, the first movie he'd snuck into as a kid. He hadn't watched it since then, and was curious to see how well it held up over the years. Unfortunately, while the scientists were trying to explain how vitamins derived from ants could mutate an entire town of humans into monsters, people started talking out in the lobby. That, on top of the unbelievable cold in this old theaterhouse, had made him cranky.
He emerged into the lobby and reprimanded the group. "Do you guys mind? I'm tryin' to watch a classic of the silver screen in here." It looked like they were about to split up anyway, making him regret the timing of his outburst.