A few that come to mind:

• How much Uranium is in the glass anyway? Should you even be holding that?
• I think it only fluoresces like this under black light, right? Does it just look like normal glass in natural light?
• Do they still make this stuff today, or is it all vintage?
• Where do you find it? If it’s mostly thrift stores and that kind of thing, do they usually know what it is or do they just think it’s regular glass?