I doubleclick text and blank areas constantly I realize this probably drives people insane, but while I'm reading a paragraph I will keep doubleclicking to select and deselect the text over and over. Somehow it helps my concentration.. I do this with code as well.

That's why I have bookmarklets to disable the dictionary lookups and other what I consider annoyances on sites that implement those features on doubleclick and yes I've been told that I'm crazy on many occasions.

I do this as well.

I do it so, when my attention gets diverted, I can quickly start from where I left off since it'll be highlighted. The obsessive clicking is because I'm obsessive.

ditto, ditto

To select a word. For example I double-clicked to select 'TextMate', so you search and find out what it is. Turns out it's a Mac text editor.