Oscar got a yellow card for this dive during Chelsea's 3-0 win against Southampton today. The score was 0-0 at the time.
After the game even Jose Mourinho couldn't disagree, saying that Martin Atkinson had made the correct decision to book the Brazilian.
Mourinho said that Oscar was playing it safe in looking for the contact but it looks as though it would have been easier to put the ball in the net.
And here's Mourinho's reaction to the dive.
http://www.youtube.com/watch?v=-eP1k7X9ZAA