I always try to cheer people that do sick tricks when I'm on the lift (always next to park) so I know they may feel better. It's good to land a nice trick for yourself, and it's even better to have someone recognize it personally and cheer you for it.
That's why I'm never ashamed to cheer people, even when my friends tell me to shut up, I still do it, hoping that someday, if I ever land something really great and be really proud of myself, someone else will also be, cheering me from the lift.