For weeks my wife has wanted me to buy her a good blender so she can consume raw fruits/vegetables in a smoothie consistency. I bought her one for her birthday and she was so happy. Yesterday, after she made her smoothie, I said kiddingly, "looks like <our 2 year old daughter's> poop". While I have no problem drinking smoothies after I made this comment (and I change plenty of diapers), she does. She is very mad at me and she associates smoothies with our daughter's poop and wants me to return the blender. She said that she won't ever be able to drink another again because it totally grosses her out. I feel really really bad about making the comment. I had no bad intentions when I said it & I've apologized to her a number of times but it has not fixed the problem.

How can she get the image out of her head so that she can continue to consume her healthy smoothies?