I was about to respond to Penny's post from this morning on this very topic...
Penny: The only quibble I have with PJ, and it's just a minor one, is the way Aragorn was throwing Frodo around when they first met...
I don't quibble with the way Strider grabbed Frodo at all... I liked the way it was done... "hmmm... who is this guy? he's something to contend with! When the hobbits bust in and he draws his sword... "Okay then! - Here's a guy that can keep these kids out of trouble!"
I like the dialogue in the film, captures that roughness...
Strider: You draw far too much attention to yourself, Mr Underhill.
Frodo: What do you want?
Strider: A little more caution from you, that is no trinket you carry.
Frodo: I carry nothing.
Strider: Indeed.... (continued... movie script)
Of course, if you read the book you knew that already, but it still made a nice moment...