i could go on for hours, but i'll just toss in a few extereme examples ife run across over my carreer:
hanging over my desk at work are a set of keys , which actually went through my PDVC unit , found them in the burn pot when cleaning the unit out (got lucky they didnt catch in the flighting and jam the auger) i called the pellet manufacturer and asked them politely if they owned a set of bolt cutters. the person on the phone with me asked "why?" i said "cause you guys arent going to be able to unlock anything at the plant". again "why?" i said because i have your keys.
had a customer call in from PA. seems the top auger in their unit was not running , naturaly i ask did you empty the hopper and check , they had not. dug out the pellets and there sits a golf ball with a big red stripe (a range ball) after a few "how the heck's" and some ministering with it , we freed it and the customer was up and running (apparantly didnt hurt the motor a lick) not a week later i have another call another jam , this guy found his problem but couldnt figure out how to get (you guessed it) a golf ball out of his feed opening. we got it out and again no problem with the motor, off he goes running , i asked him where he got his pellets , he tells me and lo and behold , turns out the supplier was a home depot located next to a driving range. apparantly someone hit a couple of really bad shots and they must have punched through the bags and were not noticed (or the bags just got taped up with the thought being that they were just snagged on somthing)
ive seen screws, roofing nails, a barbie doll (wound into the feeder between the augers, was a tough one) hazelnuts (owner wasnt to bright), had one lady who bought a stove , took it home had it installed , added a bag of pellets (literally) and got the bag wound into her feed system. another who had accidentally dropped a saucer in her hopper and the pellets set on top and the unit fed and then ran out , the saucer covered the feed opening. got a corn stove back one time with cobs of corn in it , guess the customer thought it shucked and decobbed the corn and then fed it.
ending with a lady in long island who bought a stove , brought it home got it hooked up , put her bag of pallets in it , it ran flawlessly for a day then it wouldnt feed any more pellets , she called and we started going over the stove , yep bottom auger turning , yes exhaust blower is running , door is closed, stove nice and clean , vac switch inlet clear, go to open the hopper up to see whats happening in there , she gets the bag to dig out the pellets , opens up the hopper and the pellets were all gone. she says , where are all the pellets , i asked her when she filled it up she said yesterday morning, i ask her how long did the unit run she said she wasnt sure maybe about 18 hours , she had it on 3 range, turns out she had bought the stove , vent kit and exactly 1 bag of pellets , she honestly thought that was all the pellets she would need for "at least a week or two of running" she was shocked when i explained that she would need about a bag a day minimum to heat her house through the winter if she was going to run the stove all the time.