Valentine’s Day comes but once a year, but a good sense of humor lasts a lifetime. Research has shown that laughter can be a powerful tool for relieving stress, enhancing relationships and supporting overall health, according to Help Guide. Laughter can actually improve heart function by boosting blood flow and promoting blood vessel functioning. A good laugh can also bolster the immune system and trigger the release of endorphins, the body’s natural defense against the blues.

There's a lot of pressure every year to make the most of Valentine's Day. To lighten the mood a bit, here are 15 Valentine’s Day Jokes for singles, couples and everyone in between.

1. From jokes4us.com:

Girl: I can't be your Valentine for medical reasons.

Boy: Really?

Girl: Yeah, you make me sick!

2. From activityvillage.co.uk:

Q: What did the stamp say to the envelope?

A: I’m stuck on you!

3. From primarygames.com:

Q: Why is lettuce the most loving vegetable?

A: Because it's all heart.

4. From boyslife.org:

Two antennae met on a roof, fell in love and got married. Their wedding ceremony wasn’t fancy. The reception, however, was excellent.

5. From jokes4us.com:

I'm gonna spend Valentine ’s Day with my ex...... Box 360

6. From jokes4us.com:

Q: What's the best part about Valentine’s Day?

A: The day after when all the chocolate goes on sale.

7. From onelinefun.com:

If it is not Valentine’s Day and you see a man in a flower shop, you can probably start up a conversation by asking, "What did you do?"

8. From jokes4us.com:

Q: What did one oar say to the other?

A: Can I interest you in a little row-mance?

9. From boyslife.org:

A Cub Scout found a frog that said, “Kiss me and I will become a beautiful princess.” The boy studied the frog, then put it in his pocket. “Hey,” the frog croaked, “how come you didn’t kiss me?” “I’d rather have a talking frog than a princess any day!”

10. From jokes4us.com:

I can't wait for Valentine’s Day because I get to make cupcakes for a special someone and that special someone is me

11. From oldguysrule77.blogspot.com:

Q: What did one pickle say to the other?

A: You mean a great dill to me.

12. From primarygames.com:

Q: What do farmers give their wives on Valentine's Day?

A: Hogs and Kisses!

13. From primarygames.com:

Q: Why did the banana go out with the prune?

A: Because it couldn't get a date.

14. From Reader’s Digest:

Q: Why should you never breakup with a goalie?

A: Because he’s a keeper.

15. From Reader’s Digest:  

Boy: Do you have a date for Valentine’s Day?

Girl: Yes, February 14th.