Yes, but "effectively, pratically impossible" not impossible. Every time you flip a coin 50 times, the odds of the particular resulting sequence resulting is the same as any other; one chance in 2**50, regardless of what that sequence is. So, you "beat the odds" so to speak, every time you do it.
Any sequence of 50 coins is more likely to occur than any contract bridge deal. Actually more than ten quadrillion times as likely. That doesn't make bridge impossible to play though.