as soon as youve been playing for years you will experience every type of bad beat and become accustomed to it... and from then on you will experience and see the same type of situations occur

i.e
AA cracked by KK
Your set getting ran down by a runner runner flush or straight
Your flopped straight gettin ran down by a runner runner flush or house
Your house getting rivered by a higher house.

as everyone would say.. its just apart of the game and alot of ppl cannot mentally take the swings so thats why you see alot of limit holdem players sticking to their game or some even quit poker.

i just got to agree with everyone... the only thing you can do is put your money in when you have the best hand and hope things go the way they are suppose to. poker is all about swings and the successful players understand when the swings are going bad against you, they are minimizing their losses and some even take a break from the game.

generally the best thing to do when taking a bad hit on the river or a runner runner is to leave the session and partake into something else you enjoy doing because as you know Tilt is the destroyer of all bankrolls and lives.