"You see, men" said Capt Mainwaring firmly to the assembled platoon, "when you make a bid, partner can infer that you have such and such, depending on your bid."
Perhaps you won't consider the following hand a problem. But it is the sort of hand that you get frequently, so it is important to understand the general principles involved.
On this deal from the 1999 Grand National Teams, Flight A, Eric Rodwell described the situation he arrived at as a Rio de Janeiro squeeze, so named after being described by a Brazilian player.
Play like this are certainly not everyday occurrences, but they tend to confirm that there's always something new to learn about this wonderful game called bridge.