Looking on the internet deeply has found these results:

I am happy. is the most popular phrase on the web.

I am sad. 1314,000 results on the web	I am happy. 167,000,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
"I am sad today": examples and translations in context ... See how “I am sad today ” is translated from English to Italian with more examples in context. head ... Nov 10, 2008 ... "When I am Sad", Flash, (4 min.22 sec.). short film created by ... When I am Sad, I watch Fifth Harmony's videos cause they make me smile. :). In the past few weeks, I am sad to say I have been treated in no respect by random people and my husband has been treated like a DOG by some people in the ... May 13, 2014 ... Thankyou for sharing your sadness, but an extra big thankyou in advance for how helpful this will be to use when I am sad next time. Thank you ...	And when I go to a prison I am happy. Of course I am happy. If they make the law on PACS. I am happy. I never see him but I am happy. I wrote him when I was transferred from Nazareth to Bethlehem, and he replied with his usual simplicity: 'I am happy. I see my boys in good health and I am happy. Now I can say it: I am happy. No, I am happy.

I am sad.

1314,000 results on the web

I am happy.

167,000,000 results on the web

More popular!

"I am sad today": examples and translations in context ... See how “I am sad today ” is translated from English to Italian with more examples in context. head ...
Nov 10, 2008 ... "When I am Sad", Flash, (4 min.22 sec.). short film created by ... When I am Sad, I watch Fifth Harmony's videos cause they make me smile. :).
In the past few weeks, I am sad to say I have been treated in no respect by random people and my husband has been treated like a DOG by some people in the ...
May 13, 2014 ... Thankyou for sharing your sadness, but an extra big thankyou in advance for how helpful this will be to use when I am sad next time. Thank you ...

And when I go to a prison I am happy.
Of course I am happy.
If they make the law on PACS. I am happy.
I never see him but I am happy.
I wrote him when I was transferred from Nazareth to Bethlehem, and he replied with his usual simplicity: 'I am happy.
I see my boys in good health and I am happy.
Now I can say it: I am happy.
No, I am happy.