...about some gang of biker chicks or something like that that kidnapped Chachi and some other guys, I think they were going to shave their heads or something, and then the Fonz saved the day and made each of the girls write something on the blackboard 50 times? Was it just a dream I had when I was a kid, or was there really an episode like that? If so, tell me when it was and what the title was. Another question: What season of the show (year) did Al's burn down?

I believe Al's burned down in the 1979-80 season

It wasn't Al's that burned down. Arnold's was the place that burned down. Wasn't it weird that Al didn't change the name when he bought it or after the fire?

Nope, you didn't dream that! It was "Fonzie and the She-Devils" I think. One of my favorite episodes!
Richie: You know those parties where they see who can bring the homliest girl?...This is one of those parties.
Ralph: But I'm not homely! I'm cute!

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*Shortcake Fonzarelli*
Fonzie's #1 Chick