Overly complex algorithm questions (that the interviewer expects an immediate, near-optimal solution to -- even though they were open in the literature for several years before these solutions were found); or reasonably enough questions that just aren't articulated properly (this happens amazingly often); gratuitous brain teasers, or "Carnac the Magnificent"[1] question so any sort; or just the sheer duration of some of these one-way, "prove to me you aren't a liar or an idiot, while I play with my cellphone" sessions (6-8 hours over multiple visits); and then, quite often, dealing with the candidate in a desultory fashion afterwards -- all qualify as borderline hazing, in my book.
[1] https://raganwald.com/2015/05/08/carnac-the-magnificent.html