Fell DOWN the Staircase...Embarassing..!!

I was walking in the walkway in my office, and waved to one of my students, without realizing that there is a “Spiral Staircase” in from of me. I tripped over and fell down, Luckily, I can still stand up, I wonder what would happen if I “ROLL” down!

I feel so embarrassing, but then, “so what!” everyone experiences fall down before, why I should bother so much! (Apparently, I was trying to comfort myself though! I was waving to a student that kind of caught my attention, you know!..gosh...)

I still feel the pain down my knee…..