Do aliens walk among us?

Take it easy people, I am not talking about the ones from another country.
I have a friend from high school who is convinced that outer space aliens in human form are living among us, plotting against us, and waiting for their “moment”.
I keep telling him that without evidence, there is no epistemological basis for making the assertion.
He doesn’t want to hear it.
He simply “knows” that it is true.
So I began to wonder. How many other people believe that space aliens in human form are in our midst?
Do you?
Does anyone you know?
BTW, before you have fun with me, I do not believe it, nor am I one of them.