One recent Saturday morning, we were brought downstairs by a caterwauling, which sounded like all three children singing "Oh wah-leeoh wah-leeoh wah-lee...". What we saw when we arrived in the living room was even more bizarre. The children were sitting in a circle (well, triangle), playing lugubrious air guitar and pulling grotesque faces as they sang the same words to each other over and over again.
It turned out that the objective was to make the other two laugh. It certainly made us laugh, and it made a change for the three of them to find something to do together which didn't involve them trying to assassinate one another....
Anyway, what they were singing was a seriously mutated version of the chorus of the following Lily Allen song ....