Second in an occasional series, featuring the excellent method the 'Grand Theft Auto' games have for signalling your next mission encounter - a giant, glowing pink arrow oscillating above the target. Perfectly visible at speed, driving through dense urban environments, sometimes under fire and/or listening to Foreigner. Remarkably eye-catching. (Arguably, this should be filed under 'information architecture classics', but who cares.)
Elsewhere, on Interaction Design Classics:
#1: The 'progress bar' on the Voice-O-Graph in 'Badlands'
#2: The big pink arrow from 'Grand Theft Auto'
#3: The 'A Bit More' button on the Breville Professional 800 Collection 4-slice Toaster
#4: The Melnikov House intercom system