Well, the hardest of the ones, was when I was working for IBM... with my R40 I think... that sustained about 3 or 4 coffees on top of the keyboard... and still kept going... sticky as hell, but with a bit of water eventually improved.

Others like falling from 6-story buildings and surviving to boot after that fall. Obviously not the screen, but it booted! This one was a T version...

Other times, I was on a customer with the power cord across the room, explaining something about AIX (the IBM OS)... and then I accidentally kicked the wire, and the laptop did a split-second smash against the ground. The only damage was a little corner of plastic that broke, other than that, nothing! It did not even crash... as it was running when this happened. This was a T30 I believe.

Many others... they are basically indestructible the T models at least... the X1 are very light and versatile. But at the time those didn't exist yet (I think). Good old times...