Recently I dropped my yolks into the blender, turned on the blade and started to drizzle sunflower oil drop by drop. 10 minutes later instead of delicious creamy mayo, I had swirly egg oil, yuck. I dumped everything out, grabbed four more eggs and started over. 10 minutes later, the same results. I hurled the bowl, stitched together a series of expletives that would make Christian Bale proud and went to my room to play a couple games of MW2.
Calmed by gunning down some people online, I returned to the kitchen and started over. 10 minutes later I had perfectly thick and absolutely delicious mayo in the blender. I still have no idea what happened, but I am guessing it had something to do with the membrane on the yolks being thin (I used 4 more eggs from a different box).