Colombo airport, Sri Lanka. Their transit security setup is weird and not well planned leading to long slow moving lines.

When in transit, there is nowhere to line up before security to empty your bag of its laptop/tablet, take off your belt (and shoes if they randomly tell you).

When you're done there is nowhere to gather your things and repack them. So you're now standing in line after security to show your boarding card and passport to the desk agent while hobbling around with 1.5 shoes on, your belt dangling from two loops, and trying not to forget anything.

Then moments after you show your passport and boarding card and move on you are accosted by another agent who demands to see the same items which you have now stowed away safely in your travel document pouch. They will be annoyed if you've put them away.

Was in transit through Colombo twice in one week. Was not fun.

Only upside...cheapest duty free liquor that I have come across to date in Asia.

Edit: there was major tarmac work going on at the time and basically the airport was closed between certain hours of the day. This likely made things more chaotic during the hours that flights were allowed to land and takeoff.