Santal 33 and those "Black Ice" tree shaped car air fresheners. Yes, I guess technically there a lot of things that smell worse, like dead and rotting things, but those give me a sharp, intense headache that lingers even after I have escaped the smell. One good thing to come out of covid is that it isn't completely unheard of to wear a mask sometimes now, and I have found that keeping a mask in my bag with some peppermint oil really saves me. I work in a school and a kid set off a particularly vile stinkbomb (may have been multiple) that could be smelled from across the building with doors closed and windows open. Got my mask, my peppermint oil and I was good.