The service industry has plenty of drama, long hours, and busy work to put anyone on edge.

In a recent Reddit thread, a lot of whipper-snappers confessed they’ve made some horrible blunderson the job, like overcharging customers thousands of dollars because they were panicked.

Since it’s nearly Friday the 13th (and a slow news day), we’ve picked out a few of their hilarious highlights, edited for clarity, and reprinted them here.

• “It was my second job ever and I charged $500 over the actual total. I started freaking out and getting hives from the anxiety. I had a long line and thought it was irreversible. The couple wasn’t even mad that it happened, they just wanted their money back.” —weusedtodream

• “I worked in a busy restaurant full of tourists eating lobster. I ran a family’s Visa through for $4,150. Mortified.”—cherryb0mbr

• “Somehow the cafeteria near me deposited $300 into my account, around the same time they gave me a refund. Guess they entered too many zeroes.”—Massive Response 

• “I accidentally charged a woman for a printer twice while working at Best Buy in high school … I told my immediate supervisor, who shrugged it off. F— them.”—Ruddose

• “Worked at Quizno’s. Typed too fast. Charged $173 for subs. Had to make a few calls to resolve that.”—adanceparty

And on the flipside … 

• “When I went to buy a season of ‘Lost’ on Blu Ray somehow it came up as a Justin Bieber CD for $9.99. Cashier was too busy talking to notice.”—Trotwood 

• “I worked at a store like Best Buy and sold five office grade printers for the price of one. Never told anyone.”—Jagbag13

Sourced from businessinsider.com