At today’s show, August 4 1989, a lightning storm knocked out the power four songs in. The band jammed on drums (or, at least, that was the only instrument still audible) until the power kicked back in ten minutes later. Bob returned with—what else—“Shelter from the Storm.”
You can hear the whole thing here, from the power cutting out mid-“I Want You” to the lengthy drum jam as they killed time (Bob playing cowbell, apparently—wish there were photos) to the “Shelter from the Storm” return. The moment the power cuts out comes at 3:57, right in the middle of Bob’s harmonica solo. Like he was harmonica-ing so powerfully he blew a fuse.