What would you say to Mike?

I'd act like I didn't see him, and start singing To Bid You Farewell softly to myself (but loudly enough for him to hear).
"...why can't you seeeeeee...that I try?..."
And then go right into Master's Apprentices.
"...sever the feet...from my body!"
Then he'll have to correct me and we can have a good 'ole conversation. :lol:

Actually, in reality, I probably would just think..."oh fuck that's Mike." Then wait for him to walk off and regret not saying something for the rest of my life.