Feeding the birds but SFX’s are from Half-Life

I have No idea this video gone wild after 2years but thanks for 520k+ and subs guys I guess youtube algoritm bless you and punish you at the same time (youtube slapped my wrist with reused content for some reason after 2 years) Sadly i have no idea about origin of the video it was 2 years ago I don't remember where it was from