Pinsetters reset the pins at bowling alleys
You know that machine that sweeps and replaces your bowling pins after you score a gentleman's three? It didn't always exist. Prior to 1946, when the American Machine and Foundry Company (AMF) introduced the automatic pinsetter, there were boys who did it by hand. It was a pretty thankless job, with crap pay and absolutely no free mozzarella sticks!
Lectors read to factory workers
Assembly lines aren't the most entertaining places to be, so to keep workers engaged, factories hired these guys to sit on a raised platform and read aloud to the crowd. Lectors were especially popular in 19th century and 20th century Florida cigar plants, where they translated The Tampa Tribune columns into Spanish or read portions of The Count of Monte Cristo.
Rat catchers supplied bait for betting
Nowadays, rodents are easily caught by traps or all-purpose pest control available at grocery stores. But rat-catching as a paid gig was big in the 1800s, partially because it helped stop the spread of disease and partially for a less noble reason. Men with questionable morals used to partake in "rat-baiting," a sport wherein dogs were let loose in a pit of rats, and spectators bet money on how long it would take the dog to kill them all. You might remember it from Gangs of New York. Or you might not, since you were too busy trying to forget Cameron Diaz's Irish accent.