Rob the Graphics Designer was amazed at two things I did while at his house. [1] The first is my ability to log into my home computer from anywhere on the Internet (that, and the ability to retrieve files from my home computer from anywhere on the Internet). Rob has never really used a multi-user system before and I think the concept of controlling a computer remotely isn't in his experience. Then again, he is a graphics designer, not a computer programmer or admin.
The next thing he was amazed at was my writing code. He was amazed the last time [2] Mark [3] and I coded on the fly (as it were) and this time he was equally impressed (fifteen minutes to write a C program to feed his Flash-5 [4] interface he was developing, including time to type the code in locally on his machine, uploading it to my server, compiling and testing).
I was equally impressed with his setup: a dual headed Windows box (I had no idea Windows could support multiple displays—X Windows has had this ability since 1987) on a nice fast machine. I was also impressed with his ability to navigate through the arcane interface of the Flash-5 development environment.
I guess it's easy to be impressed with stuff you aren't familiar with.
[3] http://www.conman.org/people/myg/