Making promises and release dates they dont keep... then just going in the dark about it like it never happened. This goes for a number of my faves..
Sky
Porcelain
Azealia
Gaga
Cher
B.
Specifically porcelain:
****ing with re-done.
Talking too soon..
Shading Gaga (it all went down hill after that)
Not keeping the split hair. (and saying she'd never dye it back to it even if she got a million $$

)
Getting married in a toque.