I received an emergency patient, so I started doing the routine we normally do:

Connecting him with the monitoring system, checking the ventilation tubes, taking blood samples etc..

So my colleague walks past my room and says: "Wait a minute, I'll help you in a sec."
and when he entered he said: "Where are all the other colleagues?" and I smiled, blinked  my eyes and replied jokingly: "Who needs the other colleagues if one can count on your help." (Because he really likes his help being appreciated, on the other hand: Who doesn't?) and of course he smiled too and said: "Aww, look at you, always pushing the right buttons as usual."