For me it was ‘Dirty Deeds and the Thundercheif’.
Same here.
The mate was a mighty sailing man is correct. 
The lyrics site I looked at said “lad” so I just figured I’d add that to the other lines I got wrong. “Mighty sailing man” doesn’t exactly describe Gilligan, but then “mighty” doesn’t really go with “lad”, so who knows.
You can’t always trust those sites. I came across one once that claimed the lyrics to the F Troop theme were:
His medal of honor thrilled and pleased
his proud little fam’ly group.
While pinning it on, some blood was shed,
and so it was planned he’d command
F Troop.
That ruins the rhyme scheme. Of course, it should be:
His medal of honor pleased and thrilled
his proud little fam’ly group.
While pinning it on, some blood was spilled,
and so it was planned he’d command
F Troop.
Me too… I always wondered just what in the world they were talking about.
The first couple of times I heard Yes sing Owner of a Lonely Heart, I was sure that I was hearing Shooting at a Lonely Horse.
The song Running With The Devil by Van Halen? I thought it was a song about a lonely soldier singing about the loneliness and pain of war or maybe one of the guys on the old TV show MASH.
“I got no love … no love in Korea. Ain’t got nobody waiting at home!”
Also, the song Kodachrome by Paul Simon has the lyrics: “Momma’s gonna take my Kodachrome away.” But to me it says: “Momma’s gonna take my combs and throw 'em all away.”
Eve 6, "Inside Out"
Lyric: Want to put my tender
Heart in a blender
Heard: Want to put my tenders
Hard in a blender
At a metaphorical level those amount to the same thing, I guess, but my version was a lot more painful.
Elton John, “Saturday Night’s Alright for Fighting”:
Lyric: Don’t give us none of your aggravation, we’ve had it with your discipline
Heard: …we’ve had it with your Death Star plans.
Also heard: …we’ve had it with you, just start playin’.
England Dan and John Ford Coley, “I’d Really Love To See You Tonight”:
Lyric: But there’s a warm wind blowin’, the stars are out…
Heard: But there’s a warm wind blowin’ the stars around…
Frankly, I like my version of the latter better than the real one 
In Come a Little Bit Closer… not the Jay & the Americans version, but in the cover by Johnny Duncan & Janie Frickie… I heard the line “Man, you know you’re in trouble plenty” as “Man, you know you’re in trouble, Blimpie.” I still do.
I just had to look this up because what you heard was exactly what I’ve heard forever.
I didn’t believe when I read the lyric was “quite rightly” so I had to listen for myself. The guy had a horrible pronunciation of “rightly”.
What should be either rye-tlee or rite-lee he has some weird way of pronouncing as rite-tslee.
Elton John, again. I’ve said this before in like threads, but I prefer my mis-hearing better than the original lyrics. From Someone Saved My Life Tonight:
Original version: “Someone saved my life tonight. Sugar Bear.”
My version: “Someone saved my life tonight. Should’ve they?”
I think mine sounds better, with more pathos. EJ’s version gives me a vision of him being given mouth-to-mouth by this guy.
Love that song, and exactly what I hear too.
Thank you, I feel a little less crazy. 
From Abba’s Treat Him Well
Actual: Treat him well, he is your brother.
Heard: Sleeping Willie is your brother.
Rush “Limelight.”
Actual “Living in a fish-eye lens…”
Heard “Living in the fish islands…”
I had another one on the tip of my tongue and can’t think of it now.
CSN, Southern Cross
Line: We got 80 feet of the waterline, nicely making way.
Heard: Nice Jamaican waves.
Which would work, if it wasn’t the wrong ocean.
I had to LOL at this. I heard “Sugar Bear” and was POSITIVE that I was mis-hearing the lyrics. My husband knows just about anything about pop music that I don’t, and I was afraid to ask what the lyrics were SUPPOSED to be.
You see, we were riding in the car recently, with our fancy new satellite radio that shows the artist & song title, when “No Tell Lover” by Chicago came up. I’d always heard “You’re my molten lava,” which I was sure was wrong, so I asked hubby what they were really saying. And then I glanced at the sat display to see who sang it. And the big light bulb lit up over my head. :o
Another newer song, Uptown Funk. What I HEARD is very, very racist, and I did a literal double take. Thought I was hearing those racist lyrics for quite some time and then it dawned on me what they were REALLY saying, and boy did I feel stupid. Just very glad no one heard me singing along…
What the REAL lyrics are: Fill my cup, put some liquor in it.
What I THOUGHT they were saying: Fill my cup, put some “N-word” in it.
I mean… it doesn’t even make sense, but… that’s what I heard. I kept wondering how it was getting played on the radio…