SPOILERS FOR THE THREE PEOPLE WHO HAVEN'T SEEN UNDER SIEGE"
1): In Under Siege, when Tommy Lee Jones’ Strannix completely loses it after Casey Ryback & his ragtag crew destroy Commander Krill’s sub that's carrying the nuclear Tomahawk missiles. Jones is so freakin awesome & I found the perfect link to it. “CLEAR OUT OF HERE!”
2): Mac’s pick of Jack Nicholson’s Joker having a "minor" temper tantrum after Batman stole his balloons would be a solid 2nd.