This happens to me fairly regularly at DMTC. It's harder, of course, when you're the focus of attention. Fatigue is often the culprit.
I remember when this happened to one of the DMTC Young Performer Theater regulars last year during the "Bye, Bye Birdie" Summer Workshop performance (the Summer Workshop gets less rehearsal time than usual for YPT, because of the heavy participation, compressed schedule, and double-casting). She came on for a 30-second solo. Her eyes bugged out and she sang "la, la, la," for what must have felt like an eternity. Carried it off well!
2005-05-09 15:12:13 KYLIE FORGETS WORDS TO HER SONG
Kylie Minogue was left red-faced onstage last night when she forgot the words to ‘I Should Be So Lucky’. The audience at Kylie’s London show were amazed she suddenly stopped in the middle of what is arguably one of her most famous hits. An eye-witness says, "She was half-way through the song and then she stopped. She looked a bit embarrassed and asked the audience to help out."