This weapon is a reference to the song Ievan Polkka, a popular Finnish song that was first written in the 1930s. It has gained modern popularity through covers, both by bands/vocalists and Vocaloids, with the most popular Vocaloid cover being sung by Hatsune Miku.
Sleepy Grass • Fire Element • Water Element • Wind Element • Earth Element • Protein • Int. Vitamins • Vit. Gummy • Dex. Bottle • Antidote Herb • Para-gone • Cold Medicine • Energy Drink • E. Drink S • E. Drink X • Formuade