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Turkey caller.
Put it in your mouth with the reed facing toward your tongue and do some weird stuff with your mouth I can only describe as making a tuh sound with your mouth half open and your tongue curled around it so air blows from the center of your tongue towards your lower lip.
You will sound like a clucking chicken and can do it with both hands free.
Kids in my middle school agriculture class would be chirping all the time in their classes.
You might even attract some wild animals doing it.