Lamest scene in movie?

So every single part of this movie is lame, I can't even decide what is most terrible about this movie - settings, acting, story... It's all bad. However, seems like "jokes" are lamest of all. What would be worst 1?

- Grampa?
- Shaving?
- 4some?
- Fireworks?
- Horny hippie?
...

SO many of them was simpy terribe, maybe 2-3 were funny. Which 1 was lames, and try to name one good one?