I was once taken into a room and questioned by US border personnel for eating a banana after passing US pre-clearance at Dublin airport. Technically still on I

I was once taken into a room and questioned by US border personnel for eating a banana after passing US pre-clearance at Dublin airport. Technically still on Irish soil but within the US customs zone, apparently, and I had thus lied on my form when I said I wasn't tranporting fruit or vegetables into the USA.