There are actually quite a few diseases or afflictions that can mimic drunkenness or "being high" (Diabetes, Wilson's Disease and Ataxia to name just three). I have a friend in this business who started showing ataxia symptoms in his 40's. If this poor chap at Citilink recently developed ataxia it could account exactly for the displayed behaviour. I'm not saying I think it's the case but I certainly think it's a likely as "Gorilla tobacco". And yes, as you can tell from my pprune handle, I'm very familiar with Indonesia.