It would have to be the time I paired a creamy metallic icy purple with pure black, oh ick it looked so bad I cant believe I went out like that!!!
Another bad one was a frosty bright pink with a shimmery orange as a highlight. Ahhh!!! The colors were both brand new and I didnt know what they looked like in the sun / natural light. I wake up before sunrise, so I applied them in my room, and to me the colors looked like a nice soft pink wash with a pale shimmery highlight. Luckily the sun came up and I checked it out in natural light before I went out. The orange looked SOO awful on me, as soon as I saw it I ran inside, removed it ALL, and re did it all lol. I have never used that orange again.