Almost everytime I am in the gym the same couple of guys just drop the weight to the ground when they are done. These guys are about 5'10 and weigh from 165 to 180 and they drop 40-45 pound dumbells when they finish doing flat press. Then when I go to do curls or shoulder warm ups the dumbell are all loose and f 'd up. When they are done they just walk away and don't even put them back.
I really want to say something, but I don't want to be a dick. I mean when I do the 90's I still lower them down to my knees or to the sides on the floor, I just don't get it.