I really like fermented food. Love kefir (fermented milk product), kvass (a Russian fermented bread drink). Pickles, sauerkraut...
He mentions fermented chickpeas. If you get organic foods with less preservatives in them, say some fresh salsa or chickpea salads, it will ferment pretty quickly even in the fridge and you can sort of taste it. I rather like it, and have left some things around long enough for them to ferment a bit.
Btw, if you buy pickles and they have anything else in the ingredients besides spices, water, salt and cucumbers, you are probably getting just boiled cucumbers with vinegar, so the sourness doesn't come from fermentation but from the vinegar. That is a very different taste than a properly fermented pickle. So next time look at the label and see what you are getting. One brand I have been getting lately is Bubbies (http://bubbies.com/kosher_dills) found it in a smaller local store, but there are probably others.