Uhhh, you saw what show in 1978 there king?

AC/DC was ALREADY a headline act in '78 on the 'Monster's of Rock' tour and Van Halen was the opening act for Black Sabbath that year.

You're either confused, don't know what the hell yer takin' about, or you did too many drugs that day. ;\) :p \:D

p.s. That last one I can relate to! \:D
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A day late and a dollar short...