If there is ever a lull in conversation or an awkward silence just do what I do, yell as loud as you can in a very commanding voice:
"QUICK! EVERYONE MAKE THEIR BEST RAPTOR NOISE!"
It really is quite a lot of fun. The main reason being is, that most people can hear what a raptor would sound like in their head (thank you Jurassic Park) but it is almost impossible to accurately replicate it. So most of the time when people are caught off guard and not self-conscious you can come up with some really hilarious sounds. This game does require commitment though, so only use it when lame people are not present.
Also, be aware that you must enunciate and be sure that everyone heard you say raptor. One time Matt misheard me and started yelling numerous expletives at the top of his lungs.
He thought I said rapper noise.
Welcome to my life.