Given scene/plot descriptions from movies or TV shows, and given a specific question about the scene, summarize the question into a title

In Ex Machina, If Caleb had already reprogrammed the security protocol, why did he attempt to get Caleb drunk again? Or perhaps Caleb tried to get Nathan drunk again because he thought that Nathan had been listening in on his conversations with Ava during the power outages, and thus Nathan would have been expecting Caleb to try to get him drunk, and to not do so would have made Nathan suspicious and possibly led to the whole plan to free Ava to be foiled?
Why did Caleb try to get Nathan drunk the second time?

In The Flash season 4, Thinker forces Barry to come out of the speed force and thus creating 12 different metas who were exposed to dark matter in the bus. Does he know about the respective powers of each meta beforehand or did he create the metas according to his need?
Does the Thinker know about the power of metas he created

Many movies have scenes where a man is tied to a rope which is tied from a vehicle and he is dragged for a while. The road usually has a rough surface and may contain obstructions like stones. If a person falls from his vehicle on the road, he gets several injuries. So, how do they film car drag scenes without injuring the actor/stuntman? A sample GIF:
How are car drag scenes filmed without hurting anyone?