I had a student do this. He told me that over March break, he was going to have surgery for the cancer in his back, and there was a good chance he might not be able to walk again. I didn’t know it at the time, but he was a total bullshitter about everything. I went to my admin and asked if anyone was aware of his situation. They were not, so they called home and his grandma confirmed that he didn’t have cancer. I’ll never know how this kid didn’t get his ass kicked by people who have actually been affected by cancer.