People suck. That's just it. And when you put them together, in say, an office, there's a chance they'll go about hating one another. Here are the 15 worst colleagues to ever have. There's probably more of them to go around. Check it out:

1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.