I had this guy come in yesterday and basically ask me to make him the crappiest espresso shot I could muster. "Double espresso, extra long pour." I showed him how big our espresso shots are and asked him if he wanted me to make an additional 2 shots so that he would have more espresso but it would be a better quality. He ok'd the idea and I started pulling 4 shots. One side was coming out too blonde so i stopped it and was refilling the basket when he pointed to the shots and said "What's this?" I explained what happened and said that the blonde shots would be bitter and flavorless, so I was making him new ones. "I know! I want it to be bitter! Let me have those." I said, "Espresso is bitter, but these will be more bitter than they should be and you won't be able to taste the other flavors in the bean."
"I know! This is the way I like it!" He says, getting irritated. Then he takes a sip and says "Mmm. Perfect!"
"I'm glad you like it." I say politely.
"I'm sorry you had to ruin your shot, but espresso has been my drink of choice forever."