Search boxes, like the one on here where despite how carefully you ask your question the answers have nothing to do with your question.

Likewise Holiday Cottage agencies, you filter detail like Dogs allowed, find the perfect cottage only to be told they don't accept dogs.

Train ticket sellers on line, sell you a ticket and half the journey is by coach.

Car dealerships who won't allow you a test drive until you have committed to buy!

Advertising on line which scrolls down with the text you are trying to read.