I wash my hair every day so it’s never all that dirty. I don’t repeat.
Damn right. It should say:
for (i=0;i<2;i++)
{
this.hair(lather);
this.hair(rinse);
}
It’s a question of accessibility and diversity, and someone should legislate to stop these terrible, senseless accidents. Someone should think of the geeks.
I’m assuming your question is serious. You just got whooshed, if that’s the case. ETA: If you weren’t serious, I’m the one who just got whooshed. 
In computer programming that sort of instruction: “Lather, rinse, repeat” would become an infinite loop, since there’s no instruction within that set of orders that actually tells the operator when to stop. So if someone were to follow those instructions as if they were a computer they’d lather, and rinse. Then they’d repeat, by going back to the beginning and following all the instructions. Including the repeat.
It’s call an infinite repeat loop, and can be a common failure mode for some programming errors.
(This being a more English friendly explaination, compared to jjimm’s solution using proper computer grammar.)
Shampoo experts wrote those instructions and I was taught to always follow all instructions. All my mattresses still have the warning tags on them too.
When my hair is oily enough to not work up a good lather, then I repeat. But most of the time the first time it lathers up well enough and feels clean enough after one. I only wash my hair once or twice a week.
My hair’s only about an inch long so I have no need to repeat. Once is plenty.
Dear chappachula:
Human beings come in an immense number of varieties. Not everyone is just like you.
Signed,
The Rest of Us
Yep, that’s the rubric I use. I find that repeating, I actually use less shampoo than if I keep adding shampoo until I get a good lather the first time. Two small but sequential washes get my hair cleaner that one huge, wasteful wash.
I have long, straight, thick, fine*, oily hair. I could just lather and rinse once, but it does feel cleaner after repeating.
- Yes, that does make sense… my hair is fairly fine (as in, the strands aren’t coarse) but there is just sooo much of it. Every haircut of my life has included a conversation with the hairdresser about how I have so much hair.
Very thick hair and dandruff. I find that two applications of shampoo control it much better than one.
Sigh. This is one of my things.
YOU CAN REMOVE THE FREAKING TAG ON THE MATTRESS!!!
I don’t know how the idea that the tag is illegal to remove got into people’s heads.
(And I don’t lather twice. I have short hair, and it tends to be pretty dry, so once is more than enough.)
I don’t know what the warning on those tags reads these days, but when I was a kid, the ones on my bed read something to the effect of: It is against the law to remove this tag. Nothing there about a difference between consumers and retailers. That may have changed, now, but for a long time the tag warnings were not, shall we say, very complete as to who was required to comply with them.