DJ Khaled and his crew are lucky to be able to tweet about it but it was a close call Friday night when their tour bus burst into flames.  The rapper tweeted the news that he was forced to cancel his concert in Orlando, Florida after the bus caught fire and exploded on the side of a highway.  Khaled apologized for not being able to keep his scheduled performance at the 2012 Grad Bash, adding a photo of the fiery chaos as part of his explanation.  Everyone who was on board the bus managed to escape unharmed.  No word yet on what caused the fire.