Spoiler (rot13): Lbhe fbhe erprcgbef qrgrpg npvqf. Npvqf ner zbyrphyrf juvpu unir serr cbfvgvir ulqebtra vbaf (nxn cebgbaf). Cebgbaf gnfgr fbhe.
Well, hydronium ions (H3O+). Naked protons aren't really a thing in aqueous solution.
Turns out they taste like burning (acid, in particular).
Spoiler (rot13): Lbhe fbhe erprcgbef qrgrpg npvqf. Npvqf ner zbyrphyrf juvpu unir serr cbfvgvir ulqebtra vbaf (nxn cebgbaf). Cebgbaf gnfgr fbhe.