Process synchronization is one of the most difficult subject for students learning the Operating System courses. It is due to the fact that concurrent process environment, where many events occur at the same time, is difficult to understand for ordinary human who thinks only one thing at a time. Classical synchronization examples like the Bounded buffer problem or the Dining philosopher problem fail to hook attention and interest from lower grade students who just begin to study the Operating System courses in college because these examples are either too technical or too unrealistic. In this paper we propose another synchronization example named the Bank account problem as an alternative to the classical ones. Bank account problem is proved to succeed getting high interest and understanding from the student as it is easy and realistic, and almost every student has the experience using bank account in real life. Various synchronization subjects including controlling the execution sequence of each process, incorrect result due to the race conditions, use of semaphores, deadlock, and monitor are considered to apply them to the Bank account problem.