What are you praising?

My memory verse for the week was spurred on by a reaction I heard in class yesterday. There is a Korean girl who has flunked her drivers license a couple times and yesterday she happily told the class she finally passed! The class clapped their hands and all together said, "Yay!"
Not many minutes later the professor mentioned leading his neighbor to Christ; the class did not clap their hands for joy of their new brother in Christ, or yell with excitement. There were a few low rumbles of, "that's great". Why is that?
Why are we as Christians so backwards when it comes to what we praise? We go to games and cheer like crazy! We go to church and we hesitate to lift our hands during a song of praise. I really want to understand what is holding Christians back from truly praising God for salvation.
As you go about on your day, remember this verse....

"Sing joyfully to the Lord, you righteous; it is FITTING for the upright to praise him." Psalm 33:1

Whatever singing joyfully means to you, do it. Don't hold back from being glad and having sincere hearts, praise God...Acts 2:47a
It is fitting to sing joyfully, shine forth your joy for the Lord!

Anna