I saw what they really look like and it's gross. Can't they show some truth through all the crap?

For McDonald's marketing eating your own shit, see The Yes Men:

Spratt's speech is on post-consumer waste, and how to use it to solve the problem of world hunger. The animated clip shows a man taking a shit, the waste traveling down a series of tubes and tunnels (all plastered with McDonald's logos), and finally ending up in a grinder that turns the fecal matter into hamburgers. Logically enough, the product is known as a "re-burger."