Ty-Phoo - OO vacation - (1984) 0:30 (UK)
The lady on the beach is having a cup of tea - because that's where you drink tea, of course - and lets an "ooh". Suddenly she's serenaded by donkeys: "OOOO it's a lovely cuppa...." and they sing to her about the tea. You only get an "oo!" if it's Ty-Phoo.