Trick Questions

You respond to a question, which, when glanced upon quickly appears to ask one thing, but if read carefully, asks another thing entirely.

This is very common when registering with a service. Typically a series of checkboxes is shown, and the meaning checkboxes is alternated so that ticking the first one means "opt out" and the second means "opt in". Confusing language is often also used. Currys PC World provides a good example of this on their checkout collection page: