I want to leave now

Have been thinking to visit the bookstore to grab some books, magazines and CD right after work and i had actually got myself ready to leave at 5.30pm sharp. But..... no, is not my boss who ask me to stay back (in fact he has gone no where in the afternoon), is my colleague are asking me out for dinner. Well, i am not reluctant to eat with them but seem that i will have to wait until 7pm then only i can leave this crap place. You know, i am not as motivated as my colleague do, i am now having very very low interest to my job. What am i going to do in the next hour? Hmm, i think i will have my shower in the gym.