One time in a casino I saw at the roulette table that at least 10 times in a row the number was red. Two friends of mine and me decided to go over to the table and just all our money to bet on Black with a martingale strategy. In the end we lost all, in total we saw 15 times Red and one time the 0. I m just glad we didn't have so much money left that evening to begin with.
The real life casinos are rigged in some cases so did you checked for the magnet below the table?
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15 times getting red is quite strange because I know each time they spin the chances are basically 50% or maybe 48% since there is a green 0 on the table mostly. But even then 15 times is too much and now since you mentioned it was a real life casino, I am actually starting to think it was surely rigged.
Personally I don't use martingale strategy too much but I had a losing streak of around 12 on PrimeDice long time ago and that is where I actually learned how provably fair works.
Speaking from personal experience - 16 unfortunate bets in a row are possible! That's my experience with Martingale..never used any "betting strategies" since then. At first, I earned around 20$ very quickly, but then I lost it all in like 5 minutes, plus lost the 40$ I had in there deposited, it was on the PrimeDice too, by the way. Wait, are you implying that PrimeDice is rigged? Or have I missed something?
But just theoretically speaking, from a probability point of view it can happen, however, the odds of that (if playing 50/50 chance, as I did, or in the case of roulette red/black) are, if my math is correct, 1 in 65,536, which seems rather rear...