How do you start conversation with crush?

Act like you don't like her and be confident and choose the best pick up line you've got to start a conversation with her. The one that could make her smile or could make her day. It has to be related on the place you were in so the girl can easily response about it.

Used to have some troubles before in starting a conversation with the girls I like until I found out about this video http://www.ehow.com/video_4528552_start-... that taught me techniques and effective ways to start a conversation. Go try this video yourself and tell me what do you think about it.