If you're going to make a thread here, there's some initial thoughts:
It it actually a bug?
Are you sure it's not actually just something you desire to be changed?
Are you certain that it isn't there intentionally?

Then, when you've decided it meets the criteria for classification as a bug - There will be no template for you to follow, but make sure you include:
General description of the bug/glitch/exploit.
Why it is a bug/glitch/exploit.
Steps to reproduce the bug.
Any media/screenshots if applicable.