I had the same experience on Dec 27, 2003, when flying on SQ SIN
, seat No. 33D. On all my previous flights with SQ
I was sitting more behind the plane or upstairs with a free upgrade.
As the curtain separating Economy and Raffles was not closed, I decided short after taking off to try the next lavatories ( those with the round "disabled person" label on the door) and went forward and left, and my steps took me to the lavatories, and only once inside I realized, when looking at the small orchid arrangement, that I had entered a place belonging to the Raffles Class.
When leaving the lavatories I was face to face with as SQ FA
who explained to me that I should not do it again and to give more emphasis to her teaching she eventually not smiled to me. I just smiled and went back to my seat and could see how the curtain was immediately closed behind me.
I will of course not repeat this small oversight but I must tell that it was funny.