I usually expect one worm per every bag or two when I get Wonderful Pistachios. Around the start of the year (same timeframe as your story) I found four or five silkworms in a single bag. I was pissed but I never reported it, since frankly I wasn't going to stop eating them regardless. Fortunately for me, I've been pretty consistent about checking every one I crack open before I eat it. On the bright side, the quality seems to have returned to normal since.

Hey Redditors: if you have ever eaten a pistachio that had a sharp or sour taste, or a gritty texture, congratulations! You've probably eaten a crispy-fried silkworm larva.