Either live or on TV.
Taking out the emotional aspect (i.e. if you're a City supporter then I assume it would be Aguerro, England supporters may say Owen v Argentina in 98 etc), I mean technically. One that made your jaw drop. Could be a thunderbolt from a tight angle (Van Basten?), overhead kick (Rooney?), mazey dribble (Weah, Messi). Whatever.
DON'T just post a youtube link
We can make it a ^this thread if you want.