In his Inferno, Dante never described a torture with which to punish 80s sitcom stars. But if he did, working on ALF for all eternity would win hands down.
ALF creator and head puppeteer Paul Fusco epitomized eccentricity. By "eccentricity," we mean "he sorta fuckin' believed ALF was real" and demanded nothing but the best for his cash cow. In practical terms, this meant that multiple puppeteers needed 14 trap doors built into the show's set to manipulate the puppet.
Keep in mind, the set was living-room sized. Take a glance at your living room floor, and imagine it's riddled with over one dozen Viet Cong tiger traps. Now imagine having to walk around that space without ever looking down because you're too busy making eye contact with a horrifying puppet with a syphilitic phallus for a nose.
Resetting the trap doors was an arduous process, as the only alternative was to let actors randomly fall to their deaths. Shoots, therefore, took much longer than usual, which exhausted the actors, but was the only way to avoid being the subject of a "broken neck" storyline next week.