There’s a not unreasonable chance that the presidential election is a tie, based on current polls.
Trump has a few points lead in Georgia, Arizona, and Nevada. That puts him at 268. Pennsylvania, Michigan, and Wisconsin are much closer. If Biden wins those he’d be at 269. Finally Trump is a couple points up in Nebraska’s second, which would put him also at 269.
https://www.270towin.com/maps/yPJ8v
I hope that happens, it would probably be the funniest outcome.
And there’s no tie breaker, either per state or for the overall result. 25/25? No winner, vote again. 25/24 and the last state is tied? No winner, vote again.
In the 1800 election there were 35 identical ballots until they finally made some deal and picked Jefferson.
Edit: and if the Senate is 50/50, which is reasonably could be, and neither can decide before January 20th, Mike Johnson (or Hakeem Jeffries, but lol) becomes acting president.
But I don’t think the House would tie like that. At a glance it seems like Republicans probably have the majority of seats in more than 25 states.