Hungry war robots

Funny this morning on the radio. On the Today programme on Radio 4 they're interviewing some military bod about a robot that derives its power from consuming organic materials, and Evan Davies puts it to the spokesman that the fear would be of these machines feasting on dead soldiers. The spokesman counters this by saying that these robots are designed mainly to feed on plant materials, and in any case they have to be programmed - there's a MENU! I laughed my socks off when I heard that, but no-one in the studio seemed to spot the joke.
While on the subject of inadvertent hilarity, it reminds me of a Colemanball that I heard the other week while watching the Africa's Cup semi involving Algeria, when they had a player sent off, for the commentator to utter: "He probably should already be off the field after headbutting the referee." It didn't make anyone in the commentary team laugh! I ask you, sense of humour bypass or what.