All my nerdy NICU friends have been sending this video around... I'm a little behind the times. I don't know who recorded it, but it's pretty funny!
FYI: PDA means "patent ductus arteriosus" and it means that a fetal heart structure remained open after delivery instead of closing. It's pretty common among preemies and causes a heart murmur which, at times, can be turbulent enough to sound like a washing machine when you listen with a stethoscope... hence the joke.