Uf ... That's gonna be a very long list.
- swearing,
- having sporadic choleric outbreaks,
- chewing my tongue when being extremely hectic or nervous,
- not sleeping enough (which consequently exponents my short-temper),
- being extremely bossy & demanding - personally & professionally ,
- extremely obsessed with hygiene, tidiness & order,
- being a kitchen-Hitler (controlling & directing others while they cook - or don't wanting them anywhere near when I'm cooking),
- collecting footwear
, - being a gizmo-freak ,
- being to easily annoyed by people who do not know to operate gizmos & other electronic devices (mainly elderly people),
- being an extreme cynic,
- bashing extremely religious people - I lost a few friends due telling them I found believing in fairy tales (religious dogmas, stories & norms) extremely childish & unintelligent,
- sometimes being a bit snobbish & elitist-ish
- spending to much on the net - basically every time when I can.
- being an oinky wizard

But to say something in my defense: usually I'm very funny, smart & nice guy.

But still I'm being a bit like Bangle's BMWs: you can only love me or hate me. It depends from what point of view I'm observed.
