Because Serenity is Overrated (джен)

He had been waiting all his life and non-life for this moment: to finally become one with the Force. But no, he had to find himself embodied again and in the past! He wasn't sure if it was because of Anakin or Yoda, but when he would become a Force Ghost for the second time, he would make them feel his displeasure.
Let it be known that nobody messed with an Obi-Wan Kenobi doped up with Force Powers and an unusual understanding of the Force - being dead had its advantage after all.