Oooh when I saw this thread I knew I just had to post what I have experienced to be the greatest food crime: imagine a nice BBQ chook and some pasta. Okay you've got the basics for an acceptable meal.

BUT: Now add a whole jar for full-fat Praise mayonaise and 1/2 a cup of soy sauce (yes soy!) to the hot and overcooked pasta and hot shredded chicken. Mixed until it's all gluggy and gluey, over the heat so you get that mayonaise nice and hot. Serve alone. It is virtually inedible! Who eats heated mayonaise???

This was one of my mother-in-law's classic dishes. I just detest it. She means well...

Now onto what is great. Tofu noodles with coriander from a really good noodle shop. A hot chocolate after a horrible morning at work. Cheesecake...