I haven't been onstage (in a play) for about ten years. I had the same experience Peter T. did with zero lack of stage fright as long as I was playing someone else. Being able to completely immerse myself in a role that called for me to say and do things that I would never do was incredibly exciting.

Worst thing that happened? In my first production of Jesus Christ Superstar (I know, once is experimentation; twice is perversion) I was playing Pontius Pilate. The set was modern with three ramps spaced at right angles for entrances and exits. The centre ramp was substantially steeper than the flanking ones to allow a throne to be placed at the top for the trial scenes. That throne was were I was to be for my first song after a procession across the stage. Everything went fine for the first week of performances. We were dark for two nights during which time the techies were going to tighten up the set, re-focus the lights and generally restore the set to a fresh appearance. Unfortunately the person put in charge of repainting the traffic areas was not terribly bright. The original paint had been a matte finish with sand added for traction. He decided to use a couple of coats of glossy with no sand. The first night back the actors were complaining to the stage manager about how slippery things were underfoot. None of them had yet had to tackle the "Ramp of Death". I come out for my first scene working up a little extra speed to ensure I will get to the top of this thing. I got halfway up, turned partly to acknowledge the figures standing beside me and slid, standing up, about six feet to the bottom of the ramp. Second attempt: I turn to the audience, start singing (as my musical cue has arrived and the band doesn't stop for nothing) and place one foot carefully behind me as far up the ramp as I could reach. I put as much of my weight as I can manage onto that foot, move my other foot back and the weight-bearing foot flies out from under me. I managed to catch myself with my other foot with my ass bare inches off the ground lookin like I was about to attempt some Yogic flying. According to the other cast members I didn't miss a syllable or change expression on my way down. The same could not be said of the actor playing Christ who was having (back to the audience) uncontrollable giggles.

Ah, the theatre!