It doesn't matter what color your hair is, all women (and a number of men) have their blonde moments. The many jokes about how dumb blondes are may be completely untrue (many blondes are very intelligent), but that doesn't mean they don't exist or that many people use the term 'blonde moment' to describe themselves when they do something dumb. If you feel like you need to warn others of your habit of having blonde moments, add the Warning Frequent Blonde Moments Patch to your jacket, vest, or your pants. It's one of the Ladies Patches.
This fun patch has a large 'WARNING' label on the top and reads 'this chick has frequent blonde moments' under it. The die cut border is done in yellow and black stripes like warning tape has. This does make sewing it on a bit difficult, but black thread looks just fine. You can also iron it on, of course, if you're not putting it on leather. No matter what you put it on, it's a good way of letting people know that you might suddenly do something kind of dumb. There's no real insult intended towards blondes. The stereotype of the dumb blonde has been around for so long that most blondes find it somewhat funny, or at worst aren't really that insulted by it.
Don't let people mock you for your blonde moments. Let them know they're coming with this great warning label!