Jar

Jars , also known as pipes  or vases , first appear in Yume Kōjō: Doki Doki Panic and later Super Mario Bros. 2.

Super Mario Bros. 2
In Super Mario Bros. 2, they are the main modes of transportation of Subcon; if a character goes down a jar, they will appear in a small room sometimes containing a key being protected by a Phanto. In some levels throwing a Magical Potion on to a jar will allow the player to warp through the Worlds, acting as the Warp Zones of Super Mario Bros. 2. Magical Potions will not work inside jars though. Cobrats sometimes lurk in the opening of some jars. Certain jars generate endless streams of enemies like Bob-ombs or red Shy Guys unless their entrances are blocked. jars made a small appearance in the Super Smash Bros. Melee course Mushroom Kingdom II, which also took place in Subcon. In Super Mario Advance, some jars also contain Sparks and Spark Chasers.

BS Super Mario USA
Jars also appear in the pseudo-sequel, BS Super Mario USA, and can be used in the same way as Super Mario Bros. 2. In Subspace, jars lead Mario to Wart in order to battle him.

Mario Kart 7
Jars appear as background items throughout the Shy Guy Bazaar course in Mario Kart 7. They maintain their original appearance and coloration from Super Mario Bros. 2. If driven into, they break and some items will fly out, namely bananas. Some of them can also walk and move around, and they reveal many Cobrats when broken.