Not only is Liam Neeson a hardass dad who has a very particular set of skills when it comes to recovering his kidnapped on-screen daughter (played by Maggie Grace), but he's pretty protective of her off-screen too.
The latter part is proved by this story that Grace tells Conan O'Brien when she was recently on his show. At the time of filming the first Taken Grace and her then boyfriend had a bit of a falling out, and Grace was particularly upset by it.
Neeson being Neeson wasn't too happy about it, so decided to play a prank on Grace's ex and call him at his home while in character as Taken's Bryan Mills, issuing some light-hearted limb-breaking threats.
Thanks to Grace having the foresight to record the it, we all get to hear the prank and I think you'll agree it's pretty damn hilarious. So guys, be careful if you date Maggie Grace or you might have Liam Neeson calling you up and threatening to snap your arm in two.