My grandfather died last year sometime when my son was maybe a year old. We had dinner with the whole family every Friday night so my son had seen him several times. Mt grandfather was a very quiet, proud man, but when he thought he was alone or unseen he would make silly faces at my son to get a laugh. A couple nights after his funeral my son (who liked to crawl into bed with us in the middle of the night) started just laughing uncontrollably at like 2 am. So I get out of bed to see what's going on, and find my son sitting in the middle of the living room, in the dark, laughing. I say "hey buddy what are you doing?" In toddler speak he says "Papa funny!" I got a little nervous for some reason and went to pick him up and bring him to our room for the rest of the night. And as I'm hauling him away he says "Bye papa!" And blows a kiss at absolutely nothing I can see.