Was in Bulgaria 1998.
Our 737-300 (Balkan Bulgarian "Airlines") was cancelled due to so called bad WX (even though a BA 737-EFIS managed to make the trip at approximately the same time, and also back to EGLL). Suspect the Balkan MEL wasn't up to scratch.
Ended up 4 hours later (with no announcement in the meantime) on a Cold Failed-the-MOT type Bus from Sofia to the second major "city" Varna.
There, we entered a transit lounge, some of the PAX had been there *3* days!!!!! (Makes you even forgive EasyCrap) - with no end in site, and they had been bussed around 3 Bulgarian Airports in that time (Sofia, Varna, Bourgas).
Nothing infuriates a Bulgarian as much as addressing them in Russian (they all know it no matter how they pretend) - so as I speak Russian I demanded what the hell they were going to do about it... maybe not a good idea.
Ended up waiting 18 hours in a cramped cold 50's style transit lounge with 150 or so other PAX until finally we managed to cadge a lift to London on the 727-from-hell (aka TU-154M).
Come back Easy.. all is forgiven.