It is a confusing subject, but I believe tha the thinking causes the smiling. Due to happy thoughts and memories triggered by the thought of the subject (shrekster in this case), the neurotransmitter levels of the person who is thinking are elevated, causing the brain to relesase a chemical making your facial muscles pull the corners of your mouth up
Us three need to start a YouTube channel and play Minecraft and just say these random things and talk about them for 30 mins or so. We'd be the greatest entertainment since TPing houses was made.
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