Ha ha Some days we live with "The Machine that goes Ping" and Star Wars. You get used to it.
He should settle down - don't respond to the screams - he needs to mourn in his own way, and paying attention when he does will just encourage the behaviour
For example, when Husband first met Merlin, he'd get to my place before I got off work (we were long distance dating), and Merlin taught him to come over by screaming...then Husband was taught by me to ignore him, just say a quick Hi when he came in, and be busy until Merlin stopped screaming - it worked after a few days for him, and we were back living in harmony instead of Merlin incessantly screaming for Husband to pay attention to him!