You have a hard time moving about normally. It may be because you are unusually large, heavy, or because your powers have extreme side effects, but whenever you move about things tend to break, doors jam, floors collapse, and people get pushed about.
Typical examples include huge wings, very high density, a destructive and ill-controlled aura, or just soo much Strength and too little Agility.
This can inconvenience you as dictated by the game master during interaction and investigations scenes. In addition, whenever your specific trouble has reason to come into play and whenever you roll a snake eyes roll on you suffer some kind of appropriate setback.