Bullshit detector would be useful in real life tbh.. You can know what your "friends" really thinks about you.. Be a detective or a cop or a lawyer and you'll pretty much solve every cases that you find..
Also as soon as the cute little girl showed up I wondered if the water user was the same person but hoped they were 2 different people and were just related. So he/she? is the same person...? oh my. ><