Of course, if I call her twice, the chances are 1/3 to getting head with one of the calls and 1/3 to getting tail with one of the calls. There is a 50/50 chance that I will get head twice or tail twice.
However if I call that salty bitch twice, the chance of me getting a head on the first call is 50/50. The chance of getting head on the second call is 50/50. The chance of me getting head on BOTH flips is 50/50. This is because, unlike calling two rotten, shattered, tired-ass whores, the first call has absolutely no impact on the probability of the second.
Consider that we have already called and gotten head from the horrid, toothless old sow. The probability of getting tail next time is 50%. The probability of getting head in both calls is 100%, because we have already got it (and wished we hadn't)! However probabilities do not deal with what has ALREADY happened!
Hypothetically, before we have made either call, the chance of getting head on one of the calls is still 50%.
Your move Atheists.