Day of the Tentacle. It’s from the ‘90s LucasArts Studio, before they were more concerned with churning out one awful Star Wars game after another. The basic premise is this: it’s a point and click adventure in which you, playing three dorky kids, are trying to stop a sentient purple tentacle from achieving world domination. However, one of the three kids is two hundred years in the past, one is in the present, and the other is two hundred years in the future, due to events involving a mad scientist and a time machine. You’ll have to find it via download, as I don’t think anyone sells it anymore. But it’s hilarious and crazy.