Today I'm Different on the Inside

is episode 50 of the Beelzebub anime.

Summary
Oga and Beelzebub find themselves in the wrong bodies due to the side effect of Super Milk Time. Oga who is in Beel's body goes to school to ask Zenjuro to fix the situation. Things go awry as Beelzebub runs away. Will Oga and Beel get back to their right bodies before things get nasty?