My list of annoying things
Not ranked in order of importance nor preference

1. Businesses that leave their neon OPEN signs on after closing
2. People who call my mobile phone several times without leaving a message
3. People who text generic messages (usually around holidays) to everybody in their phone book
4. E-mails and text messages that are not sent using proper grammar. Examples: no punctuation, all lower case, or abbreviations like this 'I have sumthing 4 u 2 try', etc. Disgusting.
5. E-mails that read 'Call me'. This is the worst way to get me to contact you.

...more to be added later.