▲Why People say Stupid Things◄

So I was searching on the world wide web for an answer to this question and this is the first search result I clicked on:

• Most people say stupid things because they're trying to be funny or to get attention and may not realize in the process that they are offending other people.

• Sometimes, just because, some people are stupid, and they cannot help it.

Guess I didn't have to click on anything else.
So why people sometimes say stupid things or act stupid?
Because it's in their nature. Our nature.

SOURCE: wiki.answers.com