Another anecdote - I had a 732 routine recurrency sim crew on descent via an arc and cleared them to intercept the ILS.
The boys (somewhat foolishly, I thought at the time) selected approach .. whereupon the box shortly thereafter captured a false localiser .. then the glideslope ... and down they went.
After a little while apparent crew discomfort set in followed shortly after by a degree of overt anxiety. They eventually figured out what was what far later than might have been prudent and, in the process, learnt a salutory lesson about the virtues of capturing the localiser (and checking its authenticity) prior to arming GS for the second capture.. not to mention a range of other checks which are available to save one's butt out there in the big bad world.