Be controversial for the sake of it – this only works if there is a genuine business case for doing so that fits with the culture of your company.
Mess with the litigious – an unconventional press advert for a law firm that listed the names of in‑house lawyers without asking permission, backfired dramatically. Some sectors don’t welcome edgy marketing.
Push it too far – be edgy, be amusing, but don’t be illegal. If you aren’t sure of the boundaries yourself, seek professional advice beforehand.