Indeed a NIGHTMARE!
I was stopped on the way to my boarding gate (17 if Im not mistaken at NAIA 1) by two immigration officers for more interview as a tourist on my way to the UK last year. Ask loads of questions etc etc.
TIP for those who are leaving the country:
Dont forget to bring important documents or even those returned docus you have submitted to the visa app centre. Some IO in the airport can be very crafty. Make sure you got all your docus in your hand carry too.![]()