It was the one food that (during our total elimination diet) had my son writhing and screaming on the floor within 20 minutes of ingestion.
It's been at least five years since then and I've just never been able to bring myself to feed them to my family since then.
To top it off, about a year after our experience, I found a study that said even if there's no reaction, they cause intestinal inflammation even in a 'normal' intestinal tract (whatever that means).
So, though I miss oatmeal cookies... I'm definitely happier just playing it safe and leaving them out completely.