Not even Mad-Eye Moody would suspect that Voldemort and Harry Potter pulled off the prison break together.

Truly, it is insanely mind-boggling to think about. I'm still freaking out about it myself a little, even as I, a reader, was privileged with a much broader perspective on the circumstances leading up to the event than the characters. Except maybe Quirrelmort, he's a grand mysterious meddler.