The original English sentences come from tatoeba.org which is a great source of example sentences. If you like the ones below, you can find hundreds of similar weirdoes in this list. Many of them have Finnish translations.

Aurinko on tähti.
Translation: Sun is a star.

Annotation:

Se on salaisuus.
It's a secret.

Annotation:

Olen suurin fanisi.
I'm your biggest fan.

Annotation:
In spoken language: “Mä oon sun suurin fani.”

In Standard Finnish the word for fan is ‘ihailija’, but people don’t use that word very much in conversations. At least people under 60.

Valo kulkee nopeammin kuin ääni.
Light travels faster than sound.

Annotation:

Järvi jäätyy talvella.
The lake freezes in the winter.

Annotation:

En ole ylpeä siitä.
This is not something I'm proud of.

Annotation:

Tomi punastui.
Tom blushed.

Annotation:

Molemmat punastuivat.
Both blushed.

Annotation:
In spoken language we often drop the -vat ending:
“Molemmat punastui.”

Minä haluan tanssia.
I want to dance.

Annotation:
As in Spanish, you can drop the personal pronoun too: “Haluan tanssia.”

In spoken language we may say:
“Mä haluun tanssia”
or
“Mä haluun tanssii.”

Tomi otti kuvan koirastaan ja lähetti sen Marille.
Tom took a picture of his dog and sent it to Mary.

Annotation:

Älä enää koskaan käytä tuota solmiota.
Don't ever wear that tie again.

Annotation:
Etymology: The word ‘solmio’ comes from the word ‘solmu’ which means knot.
We often call ‘solmio’ ‘kravatti’. So you can also say:
“Älä enää koskaan käytä tuota kravattia.”
In spoken language it can be ‘kraka’:
“Älä enää koskaan käytä tota krakaa.”
As you can see, in spoken language we often say ‘tota’ instead of ‘tuota’.

Sinä laulat kuin enkeli.
You sing like an angel.

Annotation:

Hän polttaa kuin savupiippu ja juo kuin kala.
He smokes like a chimney and drinks like a fish.

Annotation:

Kieli on murre, jolla on armeija ja laivasto.
A language is a dialect with an army and navy.

Annotation:

Se ei ole lelu!
It's not a toy!

Annotation:
In spoken language it is sometimes:
“Se ei oo lelu!”
or
“Se ei oo mikään lelu!”

Joki virtaa hitaasti mereen.
The river flows slowly to the sea.

Annotation:

En halua näyttää turistilta.
I don't want to look like a tourist.

Annotation:

Puu kelluu.
Wood floats.

Annotation:

Olin nuori ja tarvitsin rahaa.
I was young and I needed the money.

Annotation:

Minun isäni on vahvempi kuin sinun isäsi.
My dad is stronger than your dad.

Annotation:
In spoken language we will say:
“Mun isä on vahvempi ku sun isä.”
or
“Mun iskä on vahvempi ku sun iskä.”