If you are sitting next to someone on public transportation who irritates you...

[Alex]

And of course, in Latin and Greek alphabet based writing systems we have the silly idea of having two forms of each letter, one of which is only used as the first letter of a sentence and in other incomprehensible (to non-native writers) situations -- the rules for which change from from specific language to specific language). "Yes, students, aspirin was spelled Aspirin until it was used so much that a form of verbal erosion wore that A into an a."

I have also long wondered if the earliest scribes among the semitic languages were all left handed and that is why they wrote from right to left (as opposed to the more brilliant Chinese who decided on ambidextrous top to bottom).