Tomb Raider 2

                                     PC

Blow yourself up:
Hold walk then go forward, backward, turn around 3 times, release walk and
jump forward. Boom.

All weapons:
Ignite a flare, then step forward, step backward, turn around 3 times, and
jump backward

Level Skip:
Ignite a flare, then step forward, step backward, turn around 3 times, and
jump forward.

Thanks to Revolution readers Christian Bartra, Treeweaver and Jaguar!