I went to return a grease gun at bunnings once as the lever that holds the plunger out would let go without notice and pop all the grease out. She and the girl next to her at the returns desk were belittling saying
"Its not defective, you aren't doing it right." I said how would you do it? She goes "its not a difficult concept, you pull this knob out, latch it in, put the cartridge in and then screw the cap..."
Bang, the latch lets go and all the grease goes straight over her
I said that its an interesting feature and that a few tins of degreaser should get that out of your hair
