GREAT, hilarious thread. Keep 'em comin! (I'd post some but I can't figure out how to post a picture).
Find the picture you like.
Go to that website.
Right click on the picture and select "Copy Image Location".
Click icon above that says "Insert Image" when you lay your cursor over it. (see picture I attached)
It opens a box for you to paste that address in the top box.
And that's how you post a picture or a .gif image. At least, that's how I just did it.