Real Madrid coach Jose Mourinho was in the stands at Greuther Furth as Champions League semi-final opponents Borussia Dortmund recorded their highest-ever Bundesliga away win on Saturday.
Mourinho had been in Germany for a sponsors' event on Friday and extended his stay in order to watch Dortmund, who earned their tie against Madrid thanks to two injury-time goals against Malaga.
Jurgen Klopp's side were five goals up against relegation-bound Furth at half-time thanks to a brace each from Germany internationals Mario Gotze and Ilkay Gundogan and another from Poland captain Jakub Blaszczykowski.
Gundogan was used in a central midfield role, Gotze played on the left and Kevin Grosskreutz deputised for left-back Marcel Schmelzer.
But Klopp said he did not think Mourinho would have seen anything new, saying: "Bruce Willis was born in Idar-Oberstein and Mourinho has been to Furth. Whatever next? I could have told him Mario Gotze can also play on the left. He could have just called me."
Mourinho left the stadium after 70 minutes, missing an Edgar Prib consolation goal for Furth and Robert Lewandowski's goal - the 11th successive Bundesliga game in which the Poland striker has scored.
"It's not a surprise he left," Dortmund skipper Sebastian Kehl, who was subbed after 61 minutes, said. "I wasn't on the pitch any more."
Furth president Helmut Hack, meanwhile, spoke highly of the Real boss, saying: "He was very nice. Mr Mourinho is in no way arrogant. He was interested, friendly, humble."
When Mourinho left the Furth stadium, he was handed a selection of the finest herbal teas - and an apology from Hack for his team's performance. "I told him I have never seen my team as bad as this," Hack said.
Elsewhere, Dortmund supporters started camping outside the club's ticket office early on Monday in the scramble for tickets for the home leg next Wednesday. The tickets go on sale early on Tuesday, and around 70 fans have already started queueing.