Here is very goo example of how unhappy one can be to have AA (pocket rockets) sometimes. Surely it is far better to flop a straight draw with yours 8 and T but the ideal poker situation is to do it when somebody is actually let you see the next hand.
This is very classical poker situation when you holding AA are wondering how to take more money from your opponents. You decided to let them see more cards but as well as profitable it can be a very dangerous.
In this case the player with the drawing hand catches the cards he wants and the monster handed guy does not know how to fold such hand and brings him disaster.