Vintage Ceramic/Tiki Mugs 

As noted in the book Smuggler's Cove [link]:

I need to warn against serving cocktails out of vintage mugs- many were made before the FDA regulated lead levels in the glazes of ceramics, and so tiki mugs made before 1970 are no longer considered food-safe. 

Much like how copper mugs can leach copper into acidic beverages, lead-glazed ceramics and lead crystal glassware can leach lead into cocktails. 

See also: 

Moscow Mule/Copper Vessels (CocktailSafe)

Lead Crystal (CocktailSafe)