1. I hate door-to-door salespeople. They interrupt whatever you are doing and keep you standing at the door with their sales pitch about how good their product is.
2. No one knew how Ken had managed to persuade the boss to give him a bigger office, but they all agreed he must have had a very good sales pitch.

Compare to: (give someone a) snow job; (give someone a) song and dance. The expression is usually used to describe a sales situation (opt.1), but it can also be used metaphorically (opt.2).