Please note that this is a Doctor Who thing because it’s not really David Tennant who is in places he shouldn’t be, but David Tennant as the Doctor who is in places he shouldn’t be.
Though I doubt there are in fact any places where the Doctor shouldn’t be. It’s pretty much his job to be wherever the hell he wants to be, sticking his nose into other people’s business, and getting into the trouble of his choice.
Anyway, a few examples of David Tennant in Places He Shouldn’t Be! I really like this one:
This one is fun, too:
Many many more at David Tennant in Places He Shouldn’t Be!
Via The Mary Sue.
(If you stumble across a cool Doctor Who thing, feel free to email me with a link.)