This was always odd to me, if Voldemort wanted his Horcruxes safe, why didn't he just turn his Horcrux into a grain of rice and leave it in the middle of the safari? And I know that Voldemort is a trophy collector or whatever, but this was his soul we're talking about! Surely he could use something unsuspecting?
I mean come on Voldemort, your mother's old house and the Room of Requirement, did he really think they were good places to hide his frickn' soul? I mean you may question the diary but no one really suspects it and it's used as more of a weapon than a safe guard.
Also in the Chamber of Secrets 16 year old Tom Riddle said this:
'You're dead Harry Potter,' said Riddle's voice above him. 'Dead. Even Dumbledore's bird knows it. Do you see what he's doing, Potter? He's crying'.
And then when Fawkes heals him Voldy's just like, oh yeah... phoenix tears.
How can he be so powerful and yet so dumb?