- Scratching a mark on my glass.
- Putting a rubber band or a woman's hair band (!) around my glass.
- Drinking only Enville beers, as Enville is an anagram for Neville.
Although there are flaws in some of these ideas - I don't own a diamond and anyway the licensee mightn't like the glass to be scratched, and I don't come across Enville beers very often - I'm rather pleased that my subconscious mind was trying inventively to address one of the burning issues in life.
For info, the stolen beer was a pale or golden one.