The last school bus

"Hm, the bus is a little early, isn't it, Evan?" "Yeah, I don't know if that's the right one, either."
The bus pulled over and opened its doors. Kids tentatively started walking to the bus before deciding, yup, that's the right one. Must be a new driver. I watched as my 12 year old son got onto the bus this morning. I can't believe 12 years went by so fast. Where was my little boy i cuddle with? Read stories with? Oh, to go back in time and do it all again. I love that boy. 
I watched the kids board the bus one by one. They're all such good kids. Not one of them a trouble maker or bully. The bus stayed parked without the flashing lights. Cars went around the bus honking the horn. I walked to the bus to find out what the driver was doing. I jumped as the lights started flashing and the bus backfired. The backfiring continued, mixed with screams. 
What the hell? Blood spattered on the windows. I saw my son's terrified eyes pleading me to save him. I watched as his head came off with a blast of whatever it was the bus driver was holding. Never in a million years did I expect today to be my son's last day of school.