this took 1 hr to make.(Is it a bezier at all???) please post a camment if it is or not. HOW I MADE IT: I just made an x and a y variable for a point and a variable for it's direction. Then I made three more points. The script on how to change the variable is just change the variable x by the sin of the direction and change the variable y by the cos of the direction. Then, I check if the y is more than the Display screen and if it is, change the direction by something. Same for x. It is kind of like the block <if on edge , bounce> except you can't make variables bounce can you?! I did the same thing for all the other points and voila! A bezier! (i bet 80% of the people didn't understand that!)
