《Bad Day》的詞曲作者和演唱者是丹尼·安吉羅（Danny Angello）。這首歌的歌詞如下：
Verse 1：
I'm walking in the sunlight
It seems to pull at my insides
When you leave, the clouds start gathering
My head is pounding and I feel the worst yet
Chorus：
It's a bad day for me
And it just keeps getting worse
Got a bad day and it's lasting way too long
Gonna get through it
But it feels like I'm drowning in the sea
Oh, no, it's a bad day
Verse 2：
Every thought that runs through my mind
Comes out with a vengeance tonight
Can't shake it, it's so powerful
I feel like I'm losing my grip, my sanity slipping away
Chorus：
It's a bad day for me
And it just keeps getting worse
Got a bad day and it's lasting way too long
Gonna get through it
But it feels like I'm drowning in the sea
Oh, no, it's a bad day
Bridge：
I know that I'll get through it
But it's gonna take some time
To get over you and all that you put me through
I don't know how, but I'm gonna make it right
Cause I know that I'll be alright
Chorus：
It's a bad day for me
But I know that I'll be fine
Gonna get through it, gonna make it work out fine
Gonna make it through today, gonna make it through tomorrow
Cause I know that I'll be alright
這首歌的歌詞表達了作者在某一天感到非常糟糕的情感，這種感覺持續了很長時間，讓他感到像是在大海中掙扎。歌詞中描述了作者內心的痛苦和掙扎，以及他對未來的不確定和信心。整首歌的旋律和歌詞都非常動人，讓人感同身受。