I've had more proplems with Wendy's than any other fast food restaurant. For a place that custom makes each and every order, it's amazing how often they get it wrong.
A few years ago, Mr. KR and were driving on I-95 and we stopped at a Wendy's drive through and got something to eat. When I opened up my chicken sandwich, I saw that it had mayonaise on it and I detest mayonaise on my chicken sandwich. So, instead of turning around and going back, we pulled into the next Wendy's we saw. I marched in, told them that their drive thru people had made a mistake, and got a new sandwich