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MEET BIDEN'S IMAGINARY FRIEND...Moment a confused looking Biden sticks out his hand and appears to shake thin air after falsely claiming in speech that he had also been a 'full professor' at UPenn for four yearsPresident Biden looked lost again Thursday after finishing a speech on the nation's ongoing supply chain crisis, when he turned around and stuck his hand out as if to shake hands - while no one else was on-stage The 79-year-old president claimed before the handshake fiasco that he had served as a 'full professor' at the University of Pennsylvania despite never teaching a class at the school Immediately after ending the speech with the signoff 'God bless you all,' footage shows Biden turning to his right and seemingly saying something to the empty space behind him before miming a handshake After realizing there was no one to shake hands with, Biden stopped, looked around for a moment and then walked off the stage Last week, Biden looked disoriented during an event that saw former President Barack Obama visit the White House for the first time since leaving office. Cruz, R-Texas, quoted the clip and added a wide-eyed emojiBiden told the crowd that 70 percent of U.S. inflation could be blamed on Russian Leader Vladimir Putin Biden also claimed that he used to be a 'full professor' at the University of PennsylvaniaThe president was named Benjamin Franklin Presidential Practice Professor at Penn in 2017He collected nearly a million dollars from the school over three years for giving about a dozen public appearances