If you asked Reginald Barclay this question:
"See, you think it's gonna serve your favorite health drink, which you always order in public; but it actually gives you your "'secret pleasure' late night snack - a pile of assorted junk foods & drinks from around the known universe.
"And then, due to whatever the glitch of the week is, it starts playing back the audio of the new "'adult' holoprogram you've been writing & narrating. To the entire ship."