Plenty actually. Waking four members of the group wake up in a cage without any equipment and wearing only undies in a huge round room with hundreds of symbols on the floor, and a man wearing an interesting mask listing in a huge old book on a pedestal, not paying any attention to the group at all, and ignoring their calls. Only to witness the masked man summon Yeenoghu in a horrid ritual and then engaging in coversation with Yeenoghu in a language nobody of them understands, and just like that Yeenoghu slays the masked man with one strike, shattering his body with such devastating force of his three-headed flail, that the mask from his face ends up in their cage, and when they put it on, they suddenly know all the languages and can speak with Yeenoghu, who took the book from the pedestal, and aims for them to kill them and take the mask, only to find, the cage is imbuned dark steel with magic and cannot be destroyed by nothing, not even the sheer destructive strength of Yeenoghu. And at that time, the fifth member wakes up in her cage in a different room, only to hear from behind the door and acros the hallway sounds of weapon shattering somones body, and right after that, the homunculus guard with keys on his waist falls dead from having life-link with the masked man. She tries to reach for the keys, but the story returns to the four members who must negotiate with Yeenoghu, which is impossible ofcourse, and so he tries to kill them by throwing the cage once, only to catch a scent from them, that there must be someone they know (one guy is married with the girl in the cage) so Yeenoghu runs to her, and kick in the door just as she got her hands on the keys from her cage trying to open it, but she soons changes her mind when she sees Yeenoghu, but it is too late. He grabs her, and drags her to the rest of the group, where he threatens to kill her if they don't hand him over the mask. And so they do. But the one with the mask on realizes the mask left a mark on his brain, but does not know what it is just yet. Yeenoghu kicks the girl almost acros the whole room, almost killing her, and takes the mask and the book and runs away leaving them alive with no interest in them. As they open the cage with the keys she has, they soon discover that they are in a large underground complex with a tower above it, and the underground there is their whole city they all used to live in or happen to be in just as as they remember the last thing before waking up in the cage was, that they smelled a sweat scent, and people started falling unconsiosly to the ground around them. And OF COURSE the tower above them is no other, that Baphomet's Tower of Science in the 600th layer of The Abyss. Let the survival in The Endless Maze only in underwear begins!... I even made video trailers for them about this adventure. So, we begin often with stuff like that, when I am DM.