Collected by Jason Clarke
 Instant Rimshot
Instant Rimshot 
The classic, and likely original site in the genre. Load this site up before you tell a joke, and hit the button to punctuate your punch line.
Sad Trombone 
Created in response to Instant Rimshot, sad trombone is useful when delivering bad news. “Honey, I accidentally drove the car into the garage door…” insert sad trombone sound here. Your significant other will be laughing so hard they won’t mind the bad news.
Instant Crickets 
An alternative that is probably good to have open alongside Instant Rimshot when telling a joke. Use Instant Crickets when your joke doesn’t go over well at all. This site is particularly useful in corporate meetings when telling politically incorrect jokes.
Emergency Yodel 
When everything seems to be getting you down, you can always rely on your Emergency Yodel button. Yodels are like hugs, making everything just a little bit better. Maybe when my aunt Beatrice comes to town again she’ll accept a yodel instead of a hug? (insert Instant Crickets sound here)
Bom Bom Bom Bom Wooooo 
The sad horns sound effect from a well-known television game show where you attempt to guess the prices of everyday products. In my opinion, a better sound than Sad Trombone.
Swanee Whistle 
Basically just a down/up slide whistle sound. In some ways by itself it’s more sad than a sad trombone. Not sure how you’d use it, since it’s not all that festive sounding.
Epic Oneliner 
David Caruso’s acting skills are legendary, so why not punctuate your day with sunglasses and his serious mug?
Khaaan 
Beware, clicking this link will open a full-screen image of William Shatner’s face. You have been warned.
Mister Nice Hands 
Bad taste alert – this is a pull-my-finger page.
Instant Tumbleweed 
Another one that seems to have no real purpose. I guess you look at it when you’re feeling lonely?
additional:
Nelson Haha 
Perfect for that moment when your office mate makes a ridiculously obvious suggestion, or spills coffee all over themself.
this sucks
copyright infringement on the nelson one. I’ll be contacting FOX at once you sick s.o.b
http://www.triviabuzzer.com/ is another one i just ran into
Hey, I found another one with a collection of sounds.
http://www.soundtriggers.com
It’s the best I’ve seen so far.
Perfect at work!
My favorite site for free sound effects, music loops and samples is http://www.soundjig.com