catching lightning in a bottle

"I TOLD YOU, I'M A TIME TRAVELER - MERLIN, I CAN'T TEACH DIVINATION - "

Tom sighed. Another nutter, then. The door swung open abruptly and the man entered - green eyes blazing, dark hair looking like he just shagged somebody in the wind. Infact, he looked extraordinarily like -

ALTERNATIVELY,
The one where Harry time travels to the good ol' 40's but nobody believes him.