Being on-call means everything gets shoved aside when your department needs you.
You either carry a pager or they call your cellphone (even though they won’t pay a stipend anymore for said cellphone.)
Usually right in the middle of when you are doing something important too.
Ring, ring, ring!
Please come into work and do an exam on this ten-year chronic backpain patient who decided to come into the ER on Sunday at 3am.