How did you get Sally into a blender?
- Without much resistance.
How do you get Sally out of a blender?
- Tortilla chips.
Okay, so the joke is playing on words. First, it's implying that Sally was put in a blender, which is kinda dark. The punchline is that to get her out, you need "tortilla chips," which sounds like "tortilla chips" i.e. "tortilla chips". Get it? I know you don't.