Questionable Content is one the many webcomics I read. While it deals with risque subjects on a regular basis, as well as containing some jokes that will make your stomache turn upside down and try to run away, it's often low-key and subtle. Rarely does the comic give into fits of obscenities, and most of the vulgar stuff is limited to an a foul mouthed bird. So, when-ever you see the bird, you can probably count on the comic being a little tasteless, earthy, and blunt.
Until today. Seriously, not being able to see what the bird said and filling in what your mind thinks is simply hilarious: