Folks will remember what it was like at HKG last year in the middle of the SARS thing - the W terminal area (gates 40-80) virtually shut down.
Why then with monotonous regularity would pax mistake seat numbers (say 60D) as gate numbers and trundle off to Gate 60 which is a) dark, b) empty, and c) devoid of anything resembling an aircraft; and then sit there waiting for a,b and c to magically change.
Got to the point if missing pax were from seats in R40 thru 60 we'd just send someone out to the W terminal and be sure of finding them.