GFR

i just realized an 80 year old man's glomerular filtration rate is likely to be piss poor.

c diff treatment

i just realized that bovine fecal transplants are bullshit procedures.

rectify

i just realized that if you see an imperforate anus, you ought to rectify it.

family

i just realized that if your wife is a horse and your son is a mule, then you're probably an ass.