Try weekend night (and you've been at work all week putting in long hours each day with 30 hr shifts in between) ... you'r on call, and have been up for 16 hrs with another 14 to go (at least), you are covering 50-80 patients, your pager is going off every 1-2 minute ... you are getting paged about mundane stuff (someone is in pain, someone is constipated, someone has insomnia, someone is agitated), stupid stuff (family wants to know what's the long term plan for the patient you are cross-covering), scary stuff (patient unresponsive, patient hypoxic, patient complaining of chest pain, patient asymptomatic with BP of 220/110, patient with peak T waves with K of 9), while trying to do admissions ... all by yourself (or with only 1 or 2 other residents to help) ... and you are getting paged every 1-2 minutes because you are covering 50-80 patients (and the occasional errant page where you get paged on a patient you are not covering)
... so while you are attending to a sick or unstable patient, you are getting paged every 1-2 minutes for mundane, stupid, and scary issues (along with angry pages about wanting admission orders on the newly admit guy you haven't seen yet because you are attending to the patient who has CP/STEMI or stroke, getting paged that a family member is angry that they haven't seen the doctor yet) ... or getting a nice lecture from someone (who has never carried a pager or know what it is like) how it is important to return pages in a timely manner
you have no time to stop for lunch, dinner, or snack ... your pager goes off even when you're in the bathroom
and in the morning when the rest of the team arrives, people will question why you didn't order this or that on the new patient, follow-up lab results on another patient
Fortunately it hasn't happened to me yet (the call from hell) but i've seen other residents get BURN with this scenerio