How do I turn underline off?

I've been editing a page for about 15 minutes, and now underline won't turn off. I'll highlight what I underlined and try to change it back to normal, I'll click the underline button, but nothing. Everything I type from now on has to be underlined, and I can't submit a page like that.  
 
They should make it that you can underline, and then change back to normal. That would be alot better. You can do it with italics, but not the underline. I'm probably going to have to delete everything so now I'm really pissed off.

I just deleted everything I wrote, and the underline is still on!!!
 
 Is this supposed to happen!?

delete cookies, reboot

"I'm probably going to have to delete everything so now I'm really pissed off. "

" @AlwaysAngry said:

"I'm probably going to have to delete everything so now I'm really pissed off. "

Sounds like you're...  always angry.  YEAAAAAAAAAAAAAAAH!  But in all seriousness, just copy what you have into notepad or something. It will completely reformat it. "