There was once a professor that gave a lecture in defense of solipsism. This lecture was so persuasive that several students immediately walked up after and congratulated the professor on his defense.
"Wonderful", said one,"I agreed w/ every word."
"So did I", said another.
"I am very gratified to hear it", said the professor as he shook their hands. "One so seldom gets the opportunity to meet fellow solipsists."