1 shot of Bailey's in its own glass
1 shot of roses lime juice in it's own glass.
This is a trick, so be warned, don't do this to someone you like. Tell the person to first take the Bailey's in their mouth without swallowing. Then have them add the lime juice. Then tell them to swish it around. It will congeal and turn into something like cottage cheese in their mouth. They won't want to swallow it, and it makes a nasty mess if they spit it out. This is a great drink for someone who is C--k Blocking when trying to pick up a girl.