VIDEO : John Krasinski Trolled Jenna Fischer At Stanley Cup Game 7

(CNN) John Krasinski expertly trolled his former co-star Jenna Fischer at Game 7 of the Stanley Cup when he revealed his plus one was actor David Denman, known to fans of "The Office" as Pam's ex-fiancé Roy. " Jenna Fischer, I know we've been having our ups and downs recently," Krasinski said in a video posted to Twitter.