Ask and Dare the Sonic Prime Characters

Riddle #2

@fnafdemon says:

Dear everyone.

I suppose another riddle is in order. Whoever gets this right gets a good reward. The least logical answer gets a punishment. However, I want the Tails to don't participate in this. It would be an unfair challenge.

Here's a simple one. What goes once in a minute, twice in a moment, but never in forever?

Mr. R.

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Amy: Hmmm... that's a tough one.

Shadow: Sonic.

Sonic: Shut up Shadow!!

Rusty: It's the letter "M."

Me: Looks like Shadow gets the punishment, and Rusty gets the reward.

Thorn: Maybe you shouldn't have let Rusty participate, cause she's a robot, and can look it up on wiki-whatchamacallit.

Me: Wikipedia?

Thorn: That.

Me: (sigh) Until next ask or dare!