Sticking out like a sore thumb for just about any other reason?
[How generic, right?]
I mean honestly, there's nothing worse than walking in a place and everyone giving you that look. You know the one. It says loud and clear 'Who is that freak and what is he doing here? He doesn't belong here.'
It could be something as simple as 'Hey, look at that dude wearing pants with a rip in the back! Everyone can see he wears boxer briefs with glasses all over them.' It's embarrassing!