Gag gift

Our best man, actually, best woman, is the always the most fun at any party, but when she drinks and gets into it, she will go around and toast with everyone - you will see her all night long, glass in hand screaming 'cheers' and clinking glasses with everyone in the room. My FH decided we need to play a joke on her and get one of those breakable glasses (like on Will and Grace last night!!) and maybe at the rehersal dinner or something, get her to start with the 'cheers' and have the glass actually break! It will be so hysterical! Anyone know where I could find glasses like this?