11. Self-oral
12. Marathon training (Just run through portals that face each other)
13. Emergency puking
14. Making a hammock
15. Punching yourself in the face
16. Portable lighting (one portal at a light source, use the other one to direct the light)
17. Infiltrate places without anyone noticing
18. Being in tight places
19. Extreme tennis
20. Sending sounds over great distance
21. Alarm system(Same as the above, except something makes a constant noise at one side, then to set it off the portal is removed)
