The first thing that comes to me when I think of that number, in order:
1: The first, the best
2: Dislike this one since it reminds me of being 'second best'.. I like being the leader
3: Reminds me of "Why?"
4: Work
5: Police
6: Used to be, you know, _evil_.. Now trying to spruce up its image by changing the 'i' to an 'e'
7: Luck
8: The symbol for eternity
9: Internet
10: One shot
11: Change
12: One
14: Artificial Intelligence
15: 15 minutes of fame
17: Last
18: 7
19: My b-day!
I know, very subjective!