I just had a birthday party with my friends (I turned 20) and I blew out the candles... but then I lit them again and had somebody else blow them out, then again with another, and another, until all of us had done it. Then we blew them out all together... and I didn't stop until the candles were nubs. XD We probably spat all over the cake, but we didn't care.
At a birthday party of mine once a guest was playing with her plate, like waving it around, and blew out half the candles on my cake! She apologized for like ten minutes while I was just laughing my butt off.