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Sabrina Carpenter 's "Short N' Sweet" tour might not have been as sweet as fans thought ... she just revealed something about the tequila shot she'd throw back on stage -- she wouldn't know if it was alcohol or water until she was downing it!

Check out the singer's hilarious farewell post to her tour, which just wrapped up in Los Angeles after a successful 14-month run. In the clip, Sabrina says goodbye to various parts of her stage, including the fireplace she'd routinely down a shot at -- and she revealed she had no idea what was in the glass each night.

Hey, she's gotta keep it interesting for more than just her fans! Gallery Launch Gallery

The "Taste" hitmaker also revealed she would act shocked during the surprise song portion of her shows ... which seems to mean th

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