I'm sorry to say I've probably waited too long to do my 'First Day,' but I will attempt to recreate it in my mind as best as possible.
I remember being uncomfortable, because I dressed up in my best clothes all day. Everyone else was in the 'bluejeans' level of casual, and I felt overdressed. I also walked to work, whereas I've been riding my bike recently.
I remember being introduced to dozens of people and not being able to remember most of their names. I work with Stefan and Bernard on a daily basis, this guy named Valdemar introduced himself as, "Voldemort without the 't'" (how can you forget that?), Marcus doesn't speak English well--but I end up asking him for a lot of things anyway, and there was one other person I talk to who I don't know his name (but I thought it really was 'Bio" for a while before I realized that was just his department [Bernard would say, "Go talk to Bio."]).
I remember being afraid. Bernard (my boss) took me upstairs, introduced me to Stefan, briefly explained the project outline, showed me the oscilloscope, and told me figure out what it was by tomorrow (pleasant dreams, I'll most likely kill you in the morning). I spent three hours reading about electricity, oscilloscopes, waveforms, and pulse generators. I had lunch, where someone took me to the end of the street to order a hotdog from a vendor (I haven't forgotten a sandwich since). Then I spent five hours reading more about electricity, oscilloscopes, waveforms, and pulse generators. I almost knew what was going on by the time I went home.
I remember being relieved the first day was over.