Just out of curiousity.
For me, it was (not in any particular order)....
1. That Bank of America robbery where the police was seriously overwhelmed by the 2 bad guys with body armour and machine guns.
2. The man blocking the the path of a column of tanks at Tiananmen Square in 1989.
3. 9/11 footage
4. Drew Berrymore "flashing" David Letterman
5. The TV show "Twin Peaks"....and later on, "The X-Files".