Peeps are sometimes jokingly described as "indestructible". In 1999, scientists at Emory University performed experiments on batches of Peeps to see how easily they could be dissolved, burned or otherwise disintegrated, using such agents as cigarette smoke, boiling water and liquid nitrogen.They claimed that the eyes of the confectionery "wouldn't dissolve in anything". Furthermore, Peeps are insoluble in acetone, water, diluted sulfuric acid, and sodium hydroxide. Concentrated sulfuric acid seems to have effects similar to the expected effects of sulfuric acid on sugar.

This debate was featured in an episode of the sitcom Malcolm in the Middle ("Traffic Jam"), in which Francis, insisting the "Quacks" (as they were called) would dissolve in his stomach rather than expand, takes up the dare to eat 100 of them, doing so, but getting very sick in the process.  "

I thought those tasted old even when I was a kid and figured they were all from the first batch from 1953. Either that they trained them to crawl back to the factory after you ate them and they would just resell the same ones each year.