Me when I secretly watch my neighbor riding her bike (her chain was rusty and squeaky so I oiled it up when I applied oil to my own chain but I didn't tell her).
I know it's weird as shit but I couldn't hesitate. However I can't possibly tell her without giving creepy vibes so I'll just enjoy my good deed in secret.
"Hey there neighbor. Nice bike! I have one similar to that. insert optional small talk By the way, that squeak doesn't sound too healthy. I usually oil they chain when it does that. Would you like me to help you with that?"