Looks like there are no more takers on this. The last two I have thought of are:
Team A scores a touchdown and attempts a two-point conversion, which Team B intercepts (or recovers a fumble) and returns approximately 100 yards to score 2 points. Then B returns the kickoff for 6 more.
Team A scores a touchdown with time running out on the first half. They score a two-point conversion, and return the second half kickoff for a touchdown.