Did anyone else catch that triangular craft over Lake Michigan last Thursday night?

Bit off my usual patch here since I'm more of a poltergeist gal, but my cousin rang me from Milwaukee Friday morning absolutely losing her mind about something she saw Thursday night - big silent triangle just hovering over the lake before it shot off sideways. Now I'm seeing this thread and I genuinely can't decide if I'm jealous or relieved I wasn't there to witness it myself. Anyone who saw it - was it completely silent the whole time or did it make any sound at all when it moved? My cousin said dead quiet but she also said it was "probably a blimp" ten minutes later so I don't fully trust her judgement on these things.