If one of my siblings ever got in trouble Frank and I would go "ha ha, he he" or "yeehaw yeehoo". Once mom caught on to this and we got in trouble for laughing then we resorted to stealth laugh. We'd just move our mouths while looking a the sister who got in trouble. Ha Ha!
I actually did this in Moho but exported it to flash.
I found Moho several years ago and really loved it. It's not quite 3D but not exactly 2D so 2 and a half D. I made all the Yeti vs Gnome cartoons with it. It simplified the animation process so much for me that I was able to produce a cartoon a week for a while till I got too swamped with other things.