One should be very careful when making a bitcoin transaction and should check the address twice before making any payment but it's not like bitcoin transaction can't be reversed. Yes, it can be reversed and it depends on what wallet you use. If you use Electrum and your transaction hasn't got confirmation yet, then you have an option to cancel it by doing a double-spend. It cancels transaction by sending coins to your wallet with an increased fee, it increases fee like you do with RBF.