You are allowed to giggle even if someone died. You might want to avoid it if the police wants to talk to you, though. 
Yeah, and get rid of your weed.
It's sort of funny - yesterday at work we were talking about how when I lived downtown in SLC, the laundry room was burglarized in my apartment building. I walked in, and the place was completely fucking trashed. I called 911 to report it, and then realized that everone they would question, including myself, had copious ammounts of marijuana on hand. I then went and pounded on all the doors telling people to hide their shit cause I called the cops about a burglary. It was pretty comical.
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