Banned for munching on hospital food while hanging your foot outside the bed with a mirror taped to it so you can look up the nurses uniforms.
True story: that's what my friends and I did when we were were long-term inpatients [almost 3 years for me] and got bored shitless.... not that we could really ever see anything. The nurses knew what we were up to and some even had a bit of fun with us.