+ LIBERTY (lib) Life is one big show and in like every other performance, you have your choreography, that which is deliberately taught to a dancer for him/her to execute ... and then there are these little parts we call adlib, wherein the dancer him/herself is free to express his/her own style and personality.
It all descended, however, into a mangle of words after Roberts failed again to say the line properly and started to adlib in individual words in no proper order.
The first I fell asleep through - it turns out that early MST3K was adlib and unscripted, so isn't as funny as later seasons IMO.
They did allow for more adlib and improv back in the day.
I have heard him adlib, change lines, change whole passages while reading, and still manage to get away with it.