<human>: I have had one pretty huge fuck up in 2004 I was working in a warehouse which distributes products to its large number of shops all over the UK.

I was instructed to put boxes filled with merchandise on the conveyer belt and the computer would scan it and move it along. All went well for like 2 hours until the machine jammed, due to a heavy box pushing a lighter box until it tilted resting on the side of the conveyer machine.

I waited for someone to fix the problem for about 30 mins but nobody came. After searching for someone it seemed everyone had suddenly disappeared ( which usually happens when you need help) and the machine just had a blinking light.

So I reached in to the machine to dislodge the box, I had done this with a broom handle before and it worked fine. Only this time the detector read my arm as I pulled it out and started the machine. Read my arm as in detected, it read objects by size rather than barcodes.

So the machine starts pulling my arm in and I panic and pull my hand out as fast as I can knocking the sensor off which puts the machine in shutdown mode.

To keep the story fairly short that messed up production for the next 4 hours, no lorries could be loaded all out going boxes had to be hand sorted and it cost the company an estimated £700,000 in failed stock deliveries. Also they never found out it was me or at least I was never called up on it.

Can you succinctly summarize the text in 1-3 sentences?
<bot>: Worked in a factory, broke a machine trying to get it working again and cost the company loads of money due to massive delays in shop stock deliveries.