Two thirds of the consults in geriatrics:

This old person is in hospital with an acute infection. We put him on antibiotics, bunged an IV in his arm and catheter in his willy, doped him to the gills with painkillers and sleeping pills, and we can’t figure out why he doesn’t know the date and keeps calling us his kids’ names.

*sigh*

We docs are very good at helping sick people get well, but we sometimes forget that this stuff has a tendency to mess with the brain.