I keep coming across these Chinese riders not just on motorcycles, but also on bicycles. For the life of me I cannot understand the psychology....

1. See fast rider or unusual faster bike.
2. Almost kill self in desperate attempt to keep up.
3. Find passing place and go 100% top speed to pass other rider.
4. As soon as passed other rider pull off into side road or dramatically slow down making fast riding pointless.

What are they trying to prove? Some kind of daytime street race?