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but I don't even really know what it was.

I was watching the tv show, no reservations and the host was eating sardines (yuck) with these liettle tiny yellow sweet peppers. they were about as big around as cayenne peppers.

so I guess I should start by asking if anyone has anything similar and what its called.

Maybe sweet banana peppers? They do get quite plump if you let them go, but some varieties will grow pretty thin.

Maybe those were Hungarian Wax peppers. Those are sweet, but also have a bite to them.

Might be greek peperoncini. Similar to yellow banana peppers you get on pizza but more along the size you are talking about for a whole pepper. Generally pickled.