Please don't disturb the scientists

Some of you might have seen my post on Facebook about being surprised by a school group on a tour of my workplace. I really wanted to post the full story, but since that would be a little long for Facebook (especially the way I tend to tell stories), I decided to tell it here. :)
Wednesday was one of those days where I didn't feel fully functional until the early afternoon. I just felt out of touch that morning, but I had my to-do list at work, so I started working on getting things checked off. I'd noticed a tour group down in the lobby when I first arrived at work, but didn't think much of it. One of the main missions of this organization is educating the community, and there are often people touring the building or sitting in one of the classrooms downstairs doing some projects. It's not terribly unusual for me to be walking down a hallway and have to slip through a crowd of people to get where I'm going, so when I saw the group downstairs, it hardly even registered in my mind. I had started on the first thing on my list, and I was waiting for a machine to beep and tell me that it was done. While I waited, I was working on my computer, and was pretty focused on what I was doing there.
Now, before I go on, you have to understand a couple things about me and my lab. My desk is on the opposite end of the room from the glass door and windows that open onto the hallway. These are to my left, and I can usually people walking by in my peripheral vision...at least, I can when my hair isn't curling in such a way that it blocks that vision. I've gotten good at ignoring any movement in my peripheral, assuming it's just someone passing by or my hair getting in my way. So, when the machine beeped, and I turned to my left to get up and go to my nearby lab bench, I was more than a little surprised to see a group of high-school students standing right outside my lab. Staring at me.
My brain didn't process what was going on, and for what seemed like an eternity I just stood there, staring back at them. I was frozen, and probably turned about 15 shades of red as I stood there. What should I do?! Should I smile? Wave? Ignore them? Break down into some awkward dance moves a la Hitch? Run and hide in a corner? Finally, the beeping from the machine broke through to me, and I moved over to my lab bench to take care of it and finish working on those things. As I was working, I kept trying to surreptitiously glance over my shoulder to see if the group was still there (I'm pretty sure I was nowhere near as subtle as I wanted to be), and after a bit they moved on to the lab next door (although when they passed by again on their way to another part of the building they were all staring at me again...I guess my pipetting skills were just too fascinating).
Of course, it wasn't until after they had left that I started thinking of all the things I could have done while they were standing there. I could have done a whole routine with my spinning desk chair. I thought about faking an injury or death, but decided that something like that would be hard to pull off without letting the tour guide in on my plan (assuming my acting was at all convincing, I wouldn't want them to panic and call for help). I do, however, have a few ideas for what to do next time. I could get some dry ice to make things be all smoky, cackle a lot (like the mad scientist I am :) ), fake a major discovery (lots of yelling "Eureka!" and jumping gleefully), and maybe do a few dance moves, either with or without my spinning chair. I also think I need to put a few signs on the windows, similar to ones you see at a zoo: "Do not feed the scientists." "Please do not tap on the glass; the scientists may become violent if startled or upset." Maybe the next group that visits will have an interesting story to tell about their tour. ;)