Lionel Messi comes on with 15 minutes to go and makes one goal and scores another in his first glimpse of World Cup play. At 18 (he turns 19 next week), Messi is now Argentina's youngest goalscorer in World Cup competition, breaking the mark set by Francisco Varallo in 1930 (he was 20 years and 164 days).

No wonder Diego Maradona was going crazy in the stands.

In case you don't know him. Here's a little bit of Messi in action.