Sometimes it is perhaps better to just simply participate in pop culture... because
somehow I have never watched That 70's Show, (I ended up discovering Mila Kunis via Forgetting Sara Marshall (2008) about 10 years after everyone else... and that other guy via Spider-Man 3) which has made for a lot of awkward converations.
"Oh yea, that girl/guy from That 70's Show...
"uhm... Aston Kutcher?"
"no, you know - XYZ!"
"mhhh... nope."