First, I came across:
A bunch of geeks using solid state Tesla coils to play The 1812 overture and the Super Mario theme song .
Then, there was:
Greg Patillo, a beatboxing flute player (!), playing a unique rendition of the Super Mario theme song and the Sesame Street theme song
And then, when I went to go to the bathroom, I discovered a real-life garage band playing in the EBI underground parking lot. Apparently, they practice there during lunch time.
This makes me realize just how much I miss playing music.