coupons

being an avid coupon clipper (yes, i'll admit it -- i'm a poor writer, cut me some slack) i've noticed that a few seem to expire on dates that don't happen, except, perhaps in some alternate universe. like the coupon for jack daniels barbecue sauce with an expiration date of nov. 31, 2006. or the bunny bread coupon with an expiration date of feb. 28, 2007. does this mean they never expire?