TL;DR Dear colleagues, I use headphones not to improve my hearing! -.-

I often encounter situations when some of my colleagues start talking with me while I am listening to music. It helps my concentrate and distract from the environment. But it annoys when they ask for help and till I notice them standing near by, take off headphones they finish their question. Tried to explain, tried to use sarcasm. No result, any ideas? How you deal with these situations? Any funny ones?

Just after entering the office the heat wave hit me. 28ºC in the office at 8 a.m.?!?! Air conditioner down. Damn.

Live in North Europe they say. It's gonna be cool they say.