Well, I arrived in the US of A to work for a Part 121 carrier.
Despite my CAA Class One, the medical went on for five days.
Apart from a fairly normal Aviation Medical, I went through a stress ECG (treadmill), a barium enema, a barium meal, God only knows how many xrays, a morning with a psychiatrist in SFO and a whole day with the psychologists at Stanford University.
Mind you, what do you expect from a third world country?
The aviation medic who was in charge of this epic got me into his office at the end of the five days and asked me if I had any life insurance?
I said "Yes".
"Well don't get any more because you ain't going to die"!
It was a pain in the arse (literally) but that was also nice to know.