Muthuswamy bringing coffee without spilling

Boss :
Muthuswamy , how do you do it every single day? For 30 years u hv been bringing me coffee filled to the brim every morning without spilling it?

Muthu: Sir, before I climb up the stairs I take a big sip. as i get upstairs, I put it back

Muthu's Farewell Party is  tomorrow..😂🤔🤣