At a RIAT style show at Boscombe Down a dozen years back, the B-1B took off and pootled round for a bit with its wings forward... then disappeared off to the west and a Let 610 displayed. "Bit boring" said a friend, "you'd think they'd have swept the wings back and given us a high speed pass".
I said nothing, watched the 610 land and observed a patch of brown smoke way out to the west... few seconds later the B-1B went past just this side of supersonic, pulled up and went pretty much vertical and punched a hole through the thin layer of stratus at around 7000ft so you could see some blue... and, yes, he did a couple of rolls on the way up! Best B-1B display I've ever seen!