I put my hand on the side of my head. Sometimes two.
In more detail:
I use my middle and index finger and put them to the side of my head and then flatten them out so that they are pointing at my ear.
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Now take a trip with me but don't be surprised when things aren't what they seem. I've known it from the start all these good ideas will tear your brain apart. Scared, but you can follow me. I'm too weird to live but much too rare to die. - a7x