I think the most bang for the buck in stadium amenities has to be the bathrooms and their configuration and layout within the stadium. I am sure everyone here has had the awful experience of standing in the bathroom line for 20+ minutes just to have that beer they are drinking in line want to work its way back out of you 20 minutes later to start the process again.

Now I can not say what the perfect solution is, but I have to imagine there can be some statistics that can be run to figure out how to get that wait time down. There would probably be some mix of number of bathrooms, number of stalls, and locations that can help get this wait time down to a more managable number. Then to take that a step further, the huge line just clogs the walkways making everything else slower and really adds to overall congestion. Someone has got to be able to figure this out.