Useful Finnish phrases:

Keksit keksit. = You invented cookies.
Karmi karmi. = The frame was scary.
Ruokin ruokin. = I fed the auk.
Ruletti ruletti! = Roulette ruled!
Jätti jätti. = The giant left (me).
Riitti riitti. = (I) had enough of the rite.
Hain hain. = I fetched the shark.
Kannan kannan. = I'll carry the canna lily.
Teetä teetä! = Have someone make tea!
Koita koita! = Touch the moth!
Voita voita! = Win butter!

(Edit: "rapsi rapsi" deleted.)

@0x10f How does that work? Position determines whether it's a noun or a verb? And the same token has totally different meanings when it's a noun and when it's a verb?

@BenAveling Also, if a verb in 2nd person singular imperative form is followed by a consonant, the consonant is pronounced long. The last three phrases are pronounced approximately "teetä tteetä", "koita kkoita" and "voita vvoita".

Edit: Looks like there's a similar phenomenon in Italian, as in "andiamo a casa".
https://en.wikipedia.org/wiki/Syntactic_gemination

Syntactic gemination - Wikipedia