I thought it would be fun to have a thread about the worst shakes you have ever made. 

I have made a few really awful concoctions and I want to share them just so others don't have to endure them.  I'm not a good cook and I don't often have a good "feel" for what ingredients go well together.  Once I got bored with the shakes in the books I decided to get creative, with some yummy results.  BUT, here are the worst of my failed experiments:

Mango with cocoa powder and cinnamon - I was so happy with the additional of a little cocoa powder and cinnamon to most shakes that I got a little carried away.  This was BY FAR the worst shake I made.  I almost couldn't finish it, but I had taken it to work and there was a choice between that and a trip to the snack machine.

Mango and coconut milk - I know, this sounds good right?  Well it wasn't.  I can't explain why it was yucky but it was.  In fact, this was the last of the mango shakes because I had such foul luck with them.

Please share your own and save the rest of us the horror of choking down one of these strange brews!