1. Begin to cultivate an atmosphere of humor and laughter in your relationships by focussing on the funny things in life and enjoying the laughter they evoke. 

2. If you don ’t laugh as much as you used to and want to correct the situation start associating with humorous, fun loving people and avoid the downers.

3. Learn to laugh at yourself. 

4. Collect cartoons and jokes and put them on display on the fridge or the bulletin board for all to see and enjoy. 

5. Use humor to neutralize conflict in your relationships.

via ezinearticles

1. Check other people's opinions. 
2. Watch shows that your friends or family might find funny
3. Find a good website or blog with a big jokes repository. 
4. Be bold and go through your jokes a couple of times to see if in fact they might be truly funny

1. First, regain your smile. 

2. Treat yourself to a comedy festival.

3. Recall several of the most embarrassing moments in your life. 

4. Anytime something annoying and frustrating occurs, turn it on its head and find the humor. 

5. Read the comics every day and cut out the ones that remind you of your life. 

6. Sort through family photographs and write funny captions 

7. Every night at dinner, make family members share

8. When a person offends you or makes you angry, respond with humor rather than hostility.

9. Sign up to receive the Top 10 list

10. Spend 15 minutes a day having a giggling session. 

11. Read the activity listings page in the newspaper and choose some laugh-inducing events to attend. 

12. Add an item to your daily to-do list: Find something humorous. 

13. When you run into friends or coworkers, ask them to tell you one funny thing

14. Find a humor buddy. 

15. Exaggerate and overstate problems. 

16. Develop a silly routine to break a dark mood.

17. Create a humor environment. 

18. Experiment with jokes. 

19. Focus humor on yourself.

via bspcn