Oh man! Cardboard rocks! Have you seen the scene in TOS's "Arena" where Kirk is being "crushed" by a huge boulder the Gorn has thrown at him, and is doing his level best not to allow the wind to blow it off him?
Edit: Forgot about the Holodeck. Though NextGen used them a bit too much and they were an easy plot device. DS9 used the holosuites far better, mostly only referring to their use rather than showing them, and if they were shown, they were just an aside usually in an episode, not the whole story. Leaving aside Vic of course, which I wish they would have done.