Most common examples of misuse of singleton class

Question

When should you NOT use a singleton class although it might be very tempting to do so? It would be very nice if we had a list of most common instances of \'singletonitis\' t

Answer 1

In the case of a connection (for instance), it makes sense that you wouldn't want to make the connection itself a singleton, you might need four connections, or you may need to destroy and recreate the connection a number of times.

But why wouldn't you access all of your connections through a single interface (i.e. connection manager)?