Have there been people sucked up into UFO?

When someone has been sucked up into a UFO It's actually called "Abducted". There have been people that have claimed to have been abducted, but nobody knows if it is actually true.

There is no reason to think so. No firm evidence. And by the way, UFO is not an acronym for "Alien Spacecraft". It just means "It's in the sky and I personally don't know what it is!"