Came back on KLM once, late-night from Dubai. An overnight flight with very tired B767, no IFE, very very squashed, and absolutely 100% full - except for the seat next to me
Then at the very last second, a very big Indian guy boarded and took the seat. Normally I'm friendly but was just too tired and I could tell he felt the same so we didn't even exchange pleasantries.
An hour in, I finally nodded off. He did the same, and his head started to loll onto my shoulder. My leg flopped to the side, and I could feel our legs touching. Always an awkward moment. The last thing I remember, was thinking "oh what the hell", and just relaxed into full slumber, and off I went.
Next thing I remember was just before breakfast, I woke up to find I was in the spoons with this bloke.