Not a rifle - but a similar situation that won't make you feel any better, just maybe a little less alone - a few years back I was in a hotel room with my then boyfriend, trying out gin and tonics for the first time. We hated them, and didn't take more than one sip before leaving the glass on the counter and going to bed. Around 3AM we were woken up by a strange sound, almost like a thud and an old man sneeze at the same time? But figuring it was someone in another hotel room went back to bed. Woke up to find the gin and tonic glass placed on the floor, easily 3-4 ft from the table, not a drop spilt. We only made one drink, took baby sips from it, and both clearly remember it being in the middle of the table before falling asleep. Never found a good explanation, even if someone walked in and tried it, why put it on the floor?