I cry when I need to....never had any shame in it and never tried to stop it. If it made others around me uncomfortable, well...guess they'd have to go elsewhere!
Crying is so cleansing. It's draining....emotionally and physically....but you "get out" the pent up emotion and I can only speak for myself but I feel 100% better after a good cry.
That being said....laughing is also a great stress buster. We've gotten into the habit of watching AFV (America's Funny Videos) on Sunday nights and I can laugh so hard it hurts!

And it's exhausting, too, but in a different way. I have to change the channel right after it's over, though, 'cause Extreme Home Makeover can cause the floodgates to open with me!
I'd hope that nobody feels uncomfortable crying but I know there are many that do. I've learned over the years and throughout many heartbreaking experiences that there's no shame in emotion...happy or sad. If I didn't "let it out" sometimes I'd explode!