Bought the intro to glass blowing groupon with a friend. We went in late January so the item our class was making was a heart. Very cool class, the demonstration is very interesting and entertaining and then taking turns to do it yourself goes by really quickly but is enjoyable as well.
Guys leading the class have an adult sense of humor, but it's pretty subtle so you could prob get away with bringing a teenager and them not catching on to all of the dirty jokes.
There is an option to stay after class, pay an extra $20 and make something else from a different season's intro class, which we thought was cool. They also have all sorts of BYOB events on the calendar, would make a great date night.