This article on the rules & quirks in the glorious sport of baseball says there are twenty-three ways to get a man (any man) on first base. At first I didn't believe it, but then I read the list.
Here are the 23 ways you can get to first base.
1. walk
2. intentional walk
3. hit by pitch
4. dropped 3rd strike
5. failure to deliver pitch in 20 seconds
6. catcher interference
7. fielder interference
8. spectator interference
9. fan obstruction
10. fair ball hits ump
11. fair ball hits runner
12. fielder obstructs runner
13. pinch-runner
14. fielder's choice
15. force out at another base
16. preceding runner put-out allows batter to reach first
17. sac bunt fails to advance runner
18. sacrifice fly dropped
19. runner called out on appeal
20. error
21. four illegal pitches
22. single
23. game suspended with runner on first, that player is traded prior to the makeup; new player is allowed to take his place
