I would have a special knife handle that holds dry ice blades. A small freezer strapped to my side would hold the blades until I insert the handle, which would attach to one of the blades, then I'd stab someone, and release the blade inside them. By the time the police would show, the blade would evaporate, leaving no evidence. I'd do it A Perfect Murder style, wearing a suit of plastic so I leave no evidence. I would also carry two silenced glocks if things got ugly. I would only kill people who piss me off. Like this one time me and my friend were searching for a table in the lodge for like half an hour, we were totally beat wearing ski boots walking around endlessly. Finally we find a table, and as soon as we sat down some old guy with a skullet came up and told us this was his table, so we got up and him and his family marched in and sat down. We realized the table wasn't theirs as we were walking away cause they all took off their gear and put it on the table. The prick figured he'd just bully some teenagers so he could sit down. He would definitely die in the mens room.
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I woke the same as any other day
Except a voice was in my head
It said seize the day, pull the trigger
Drop the blade, and watch the rolling heads.