An unopened bottle of ammonium hydroxide, still zip-tied in its shipping bag, leaked down into the OSHA-approved flammables cabinet, which had a damaged seam due to its own shipping damage. Managed to avoid breathing much of it when I emptied the fun solvents from the cabinet, but just a little bit was enough to give me a scratchy throat. Nasty stuff. I think I'm going to leave that sort of thing to NileRed, from now on.