Some people would like to drink less, but they have a hard time sticking to a small number of drinks. If only there were some sort of overcomplicated technical solution to this problem!
This “shrinking wine glass” (Figure 1) could be a solution to excessive drinking. Such a glass consists of two components: a normal wine glass base and a snugly-fit cylindrical top (cup) portion that can slide up and down the base.
Over time, the cylinder slowly slides down, reducing the maximum capacity of the glass.
The exact mechanism by which this functions has not been totally worked out, but it’s obviously the case that it would need to be non-trivial for the user to “reset” the glass.
The same general approach (in a slightly different form factor) should also work for beer.
PROS: Could probably actually be implemented with relatively little random wine leakage.
CONS: The real deal-breaker here might be discouraging the user from just getting another glass.