Payphones
When was the last time you saw someone using a payphone? Nearly everyone has a cellphone today, and few people carry change, so payphones are an irrelevant thing of the past. They can still come in handy in case of emergency, but half the time, most of them don't even work.
Pennies
Pennies are one of the most expensive coins to manufacture and one of the most useless during transactions. The time it takes to count out pennies at the register when you could just swipe your card is one of the shoppers' biggest pet peeves. Eventually, all coins will probably become absolute, even the most-valuable quarter.