Sue's stain

Sue came back from the loo, having dropped a bit of her dinner down her:
Harmi: "Sue, what's that damp patch on your skirt?"
Sue: "I dropped a bit of cherry yoghurt down me, and I didn't know if it would stain, so I rubbed it with some water.."
Then feeling she needed to say more:
Sue: "I haven't wet myself!...I know I'm a certain age now, but I'm not incontinent yet."