What is the one thing at work you hate more than anything?

hate when lazy *** coworkers damage or just randomly screws something up and just leave it instead of fixing it.

love about my work: doing something for a customer that the customer never thought was possible, working with and doing all kinds of manufacturing and development with a mandrel tube bender capable of anything from 1½" to 3"stainless steel. welding is alot of fun also,but making a customer happy is the best part of it!