I talk Hebrew in this video, but its nothing important. Sorry about the video quality - its a phone's camera.
Step 1: Get Wasabi
I chose the free way as you can see :)
It is also prefered if the toothpaste is greenish in color for obvious reasons.
Step 2: Make it feel like a paste
**tip - you can extract some toothpaste out of the tube into the wasabi and mix them up. This way the texture and the color will match even better!
Step 3: Fill the tube
Step 4: Don't put a hidden camera....
On the other hand, if you're shot to the sink is clear, it can be a pleasure to watch :)