Empty Tank

The other day was running errands on my scooterette(Honda Activa) and ran out of petrol. Had noticed the fuel gauge to be below the red line the previous day itself and being lazy thought that i can ride the Activa for a few kilometres more. My guesstimates had all gone wrong and there i was stranded around 500 meters from my house. Parked the Activa with out losing my mind walked home and asked Chan who runs the Puncher shop in our building to get some petrol and retrieve the Activa for me. Chan took the money i gave him found himself a empty water bottle and took of to the petrol pump. After nearly fifteen minutes Chan was back with the Activa and he rang the bell and i stepped out of the house. He exclaimed that the tank was totally full seemed a bit pissed off that i had made him run a useless errand but then i had checked and made sure that the tank had really gone dry how could this be? Checked the Activa and saw that its really not my Activa the same make and same colour but definitely not my bike. Chan had picked up some other Activa which had opened with my keys and found the tank to be full. Both of us quickly rode upto were the Activa had been parked and parked it and went to my Activa which was a few meters apart filled that with petrol and got it home.