Some messages behind the bikes - what it means?

For more than a year, while going to my office, I noted following messages displayed above the number plate of the bikes, that appeared to be funny, entertaining and thought provoking.

1. All girls are my sisters except U
2. Don't worry girls, I will be back
3. Romeo should die
4. Ask ur sister who I am
5. Who's next (to ride on pillion?)
6. Don't look at me, I am not your girl friend
7. I am with your mother, I warn you
8. Love is strong. If it has broken, it is painful
9. Love is like a war, easy to start, hard to end, impossible to forget, so never love any time
10. No girls, no tensions
11. Don't believe girl's smile
12. Don't believe smiling girls
13. GIRL - Ghost In Real Life
14. Love is Trash, Girls Need Cash
15. Girls R like medicine, they come with an expiry date
16. Trust dogs, not girls
17. No fear
18. My bike rages the road
19. Everybody wants to go hell, But nobody wants die
20. Don't touch me
21. Don't follow me, my way is Dangerous
22. Keep distance for your safety
23. You r responsible for ur safety
24. I am bad with my new rule
25. I am not as innocent as I look
26. Hell is full. So, I am back
27. Mom's gift, Father's petrol, My enjoyment
28. Legends live longer. I am a living example
29. Legacy never dies
30. Past is a lesson. Today is yours. So work on it
31. Small things bring big changes

The number of bikes with above displays are very less. Apart from the above, there are regular messages on a large number of bikes, like, Mom's gift / Dad's gift.

A study of these messages reveals that many bike riders are grateful to their parents for gifting them a bike. But,  other messages reveal, hatredness towards girls, love failures, fear, their road rage behavior, road safety concern, philosophers, want to show girls about their machoism, warn others about themselves, their funny side, and so on. 

Some messages, at first instance, even enrage the readers and appear vulgar. 

May be, one can judge the person, depending upon the type of message behind the vehicle and take suitable precaution while dealing with them.