Does every sentence starting with CAN have to end with a question mark Especially if the sentence is more of a request than question?

>>I can't think of any instance where a sentence would begin with "Can" and not end in a question mark. But of course, there is an infinite quantity:

"Can openers are great."

"Can openers in purple are my favourite!"

"Can openers aren't usually seen dating garlic presses."

"Can openers [predicate]."

... ;-)