protagonist saw a little kid wheeling some old guy in a wheelchair. he thought the old guy was the evil one, but it turned out the kid was the evil one. i think they were in a hotel maybe. little kid might have been a shape shifter or possessed or something, not sure. was probably sci fi or mystery
i have a list of anime i remember watching, but this scene doesn't ring a bell in any of them:
dbz
Death Note
Future Diary
Code Geass
Elfen Lied
Deadman Wonderland
Darker than black
Guilty Crown
Chrome Shelled Regios
baccano
noir
monster
fullmetal alchemist
fullmetal alchemist brotherhood
Kurokami
sword art online
code breaker