Day 4: Habit you wish you didn't have

I wish I didn't bite my nails and I wish I didn't crack my knuckles. These are pretty lame habits but they are what they are.

They don't really pose any issues but I'm afraid I'm gonna be 87 and not have use of my hands and all I'll be able to think was "Dammit, you should've stopped cracking your knuckles when you were 10. Now you can't even hold a spoon and your poor grandkids have to feed you your pudding and apple sauce because your children never show up at meal times here at the nursing home." 

That just sounds like a miserable life.