I am a movie director and I just received the following movie plot. Could you help me answer this question? If not, let me know by writing "Not answerable". Plot title: The Texas Chainsaw Massacre Movie plot: On August 18, 1973, five young adults - Erin, her boyfriend Kemper, and their friends Morgan, Andy, and Pepper - are on their way to a Lynyrd Skynyrd concert after returning from Mexico to buy marijuana. While driving through Texas, the group pick up a distraught hitchhiker they see walking in the middle of the road. After trying to talk to the hitchhiker, who speaks incoherently about "a bad man", she pulls out a .357 Magnum and shoots herself in the mouth. The group goes to a nearby eatery to contact the police where a woman named Luda Mae tells them to meet the sheriff at the mill. Instead of the sheriff, they find a young boy named Jedidiah, who tells them that the sheriff is at home. Erin and Kemper go through the woods to find his house, leaving Morgan, Andy, and Pepper at the mill with the boy. They come across a plantation house and Erin is allowed inside by an amputee named Monty to call for help. When Erin finishes, Monty asks her for help. Kemper goes inside to look for Erin and is killed with a sledgehammer by Thomas Hewitt, also known as "Leatherface", who drags his body into the basement to make a new mask. Meanwhile, Sheriff Hoyt arrives at the mill and disposes of the hitchhiker's body, wrapping her in cellophane and putting her in his trunk. When Erin returns, she finds that Kemper is still missing. Andy and Erin go back to Monty's house, and Erin distracts him while Andy searches for Kemper. Monty realizes Andy is inside and summons Leatherface, who attacks him with his chainsaw. Erin escapes and heads towards the woods, but Leatherface slices Andy's leg off and carries him to the basement, where he is impaled on a meat hook. Erin makes it back to the mill, but before she can leave the sheriff shows up. After finding marijuana on the dashboard, he orders Erin, Morgan, and Pepper to get out of the van. The sheriff forces Morgan back into the van, and after giving him the gun he took from the hitchhiker, he tells him to reenact how she killed herself. Morgan, scared and disturbed by the... My question: What do the five young adults but in Mexico?
The answer to this question is:
marijuana.