My neighbor's boyfriend is an idiot, he got drunk last night and decided to "scare" his girlfriend by climbing her balcony while wearing a hockey mask and screaming "open up I have a gun" the only problem is he was so drunk he came to my house instead. As soon as I heard someone climbing my balcony I pulled out and loaded my rifle...

the poor kid pissed himself, cried and said "where's Gina?" As soon as he took his hockey mask off (I yelled at the poor idiot "take your f-ing mask off so I can see your face while I f-ing shoot you") I realized who he was and now I feel rather bad.

what is the proper way to apologize after almost killing a drunk idiot?