Here's a fun one to debate with your skate friends, nollie and fakie tricks are "swapped".
For example:
- nollie fs 180 and fakie fs 180 (fs half cab) are two different directions: nollie fs 180 is in front of you and fakie fs 180 is behind you going blind
- nollie 5-0 and fakie 5-0 (fakie switch nosegrind) lean differently on the grind: nollie 5-0 you pop off your nose and land on your back truck, fakie 5-0 you pop off your tail and land on your front truck
- nollie noseslide and fakie noseslide are different motions to get into the slide: nollie nose you pop off nose and land on the nose in the ledge, fakie nose you pop off tail and land on the nose but you do a sort of half cab
The key distinction in the argument is that in fakie, your tail is always considered your "tail". Therefore you treat any derived tricks as being "backwards". In the 5-0 and noseslide examples, you're still popping off the front of your board, but you classify it as nose or tail based on if it's nollie or fakie.
There are caveats though such as "fakie crook" where if you kept the rule it should be "fakie suski", which no one says.
There's a million arbitrary and nonsensical rules in skateboarding which is part of the reason to love it, especially for something that "has no rules".
And remember, never carry your board by your truck :)