Jim Henson's Muppet*Vision 3D is a must see for all ages.   It has the most delightful special effects on all of MGM and that takes some going.   There's a big theater and often long lines but the line is entertainment in itself with dozens of laughs before you even get into the building. . . so, if there's no line you are going to miss a lot.   When you get inside, you are given 3-d glasses to put on once you're seated in the theater.   Before seating there is a humorous pre-show while you're standing in the lobby . . . be sure to look around here, there are a lot of puns to be found.   And the 3-D show itself is laugh-filled fabulous.   Getting a pie in your face is just one of the things that makes the audience roar with laughter.   The show has an explosive ending.   Don't miss it.