It can be irritating at times when, some companies send you tons of junk mails (e.g. surveys, insurance quotes) and make follow-up calls thereafter.  As if it’s not enough that you spend time sorting the mails, reading through them and eventually throwing them away, they still call to follow-up on their marketing gimmick.  However, I do feel for these people who do hard selling for a living.  It is indeed a tough job.  But time is precious to be wasted for these kinds of nuisance.