Ok this actually happens to my friend not so long ago, he is going on a boxing match and he will bet for the heavy favorite, then suddenly an unknown guy whisper to him, that the fight is going to be fixed and he supposedly heard it from the favorite to win, locker room, are you going to listen to that and bet for the underdog.
What's your take?
The moment you have a second thought about where you are going to put your bet, you already lost. You don't want to listen to a stranger that randomly walks towards you and say something like that, most of the time it is just a bluff or he is just making fun of you, and if he successfully get into your mind, then you are messed up. So if you are having a hard time deciding where to bet, because you have second thoughts, please don't bet your money, I'm 100% sure you are going to lose that bet.
Go to another game and place your bet on something you are sure about, so you will not regret anything you do in the end.
It's just plain stupid, to be honest. And i think people aren't dumb enough to place bets based on the suggestion of a complete stranger. That just won't make sense
That's stupid, without doubt, and it doesn't make sense either
But stupid is how human mind works in default mode and stupid is what humans do all the time, all of us (so it is kinda natural). Technically (or should I rather say psychologically?), what we are dealing with here is called priming. Priming works unconsciously and it is a real thing even if it is subliminal (you can search Google for a thorough description and explanation of this phenomenon and how it works in real life)
In simple terms, if you are undecided on some matter, the events that immediately precede the moment you make the decision (whatever those might be) will heavily affect it even if you are completely unaware of the connection. So if someone wants you to make a certain decision or just instill doubts about that decision (which seems to be the case here), they can plant the seeds of doubt in this manner and that will in fact cause doubts
My action will depend on who this person who tells that is
If the person is a total stranger (as per OP), the most likely explanation is that you are massively undecided (which can be easily read from the cues your body and face betray) and someone wants to make fun of you by taking your indecision to the next level (apart from manipulating you into making a wrong bet)