2 blondes (sheri and teri) walk into a bar and say, "drinks are on us."
after 3 rounds the bartender says, "this is really great that you are buying drinks for everyone, but what's the occasion?"
sheri says, "we finally finished a jigsaw puzzle! and the best part is that it only took us 7 months."
the bartender says "seven months? that seems like an awfully long time."
teri says "we thought so too, but the box said 2 to 4 years."