The ninja way is to visualize the straightness of the rope. It will begin to untie itself... Or a knife is good.
12 seconds sound clip from the Beverly Hills Ninja movie soundboard.
You can hear this line at 01:02:11 in the Blu-ray version of the movie.
Quote context
[...]
- Haru!
- My dove!
- Let me get this blindfold off.
- It is in the spirit of harmony we meet here today.
- It is important to our community an agreement be reached.
- Stop squirming. I've got to get these ropes untied.
- My suggestion is that you allow us to make your plates our plates.
- You know I have great respect for you, but I rule in favor of Mr. Tanley.
- You won't get away with this.
- I will capture these criminals and make them face the American justice system.
[...]