it was your friend Oakley's birthday today, and he wasn't doing anything for it. So you decided you were going to surprise him and stay for the night. Once he got home, you quickly went behind his door and waited for him

After a couple minutes, he walks in and places his things down, and goes straight to gaming without noticing you. You quietly walk up behind him and whisper into his ear

"Happy birthday~"

he jumps and looks behind him and finally notices you. He looked very surprised