This happened at the Vic Mignogna's Panel at AX 2006. Someone requested he do some YAOI (maleXmale) FANSERVICE in Ed's voice, not unlike what happened last year that I heard when he said "I love you Roy Mustang" or something to that degree.
The quote is "BACK OFF RIZA, HE'S MINE!!!"
The camera was shaking a bit. There are also some comments I made but that's besides the point! HE DID FANSERVICE!!!
He also added a small bit "Unless I give him to you..." or something to that effect but~ I didn't managed to tape that I think the Possessive line's enough, yo!