The most annoying ad on telly right now...
Mother rushes to get her son ready for school. Just as the bus pulls up outside, she notices... gasp!... a stain on his school shirt! An empathetic-sounding voice-over says, "Isn't it frustrating..." and goes on tut-tutting about how this poor, overworked mum has spent hours washing, sorting, ironing and folding a load of washing, only to find the offending, persistent stain when it was all too late. If only she'd used this laundry spray (Preen, I think), this never would have happened.
If only the mother had looked at any of the clothes while she was washing, sorting, ironing and folding, she might have noticed the stain a long time before the school bus showed up.