THX
Terminator 2:  A change of the "Cavalcade" trailer shows a floating, electrified ball of energy on the screen, which is quickly replaced with an identity scanning device. The device fires beam that scans left to right, as if scanning the viewer's eyes, after which the "T2" logo appears. The logo is then shot by the Terminator (his reflection is slightly visible on the logo) causing it to explode into small, irregular pieces. Sparks fall as the pieces slowly melt into a silvery liquid, which then transforms back into the THX logo, and then plays the "Deep Note" sound.