Workplace humor in the midst of change

A recent conversation with a colleague, loosely paraphrased:

Colleague: You seem to be handling all these changes to your job calmly and with a zen-like attitude. I'm impressed. Are you on medication or something?

Me: No. Should I look into it?

Colleague: That depends. If I say yes, are you going to snap and throw something at me?

Me: No. But I reserve the right to throw something at you in the future for other reasons.