People who use invalid HTML markup, worse yet when people teach invalid HTML markup >.> a.k.a. my professor this semester
For example, the href, she told everyone that a valid href would be
<a href="http:www.google.com">Google</a>and another instance
- When people walk slow in the hallways at school.
What's worse is when people just stand in the middle of the hallway and you have only a narrow passage to walk through.