Shot glasses & Chemical Cocktails.

[Clarks]

Shot glasses currently hold 10 units and are drunk in two 5 units sips, like regular glasses.

They could be used for some chemistry drinks, if they were made to hold at least 15 units all drunk in a single sip.
Why 15 units? It's the minimum for a lot of chemistry to work, and even then an uptick in lag can cause failure.