Toga from 'Animal House'

Origin
Robin Williams was a noted comedian and actor who was (and is) widely respected by many. He used his comedy to hide his chronic depression and was often known to lift the spirits of everyone in the room. Though he was involved in many projects, today he is most remembered for his numerous iconic characters such as Mrs. Doubtfire, John Keating and the Genie from Aladdin. In August of 2014, he was found dead from suicide, a tragic reminder to many that his positive public face masked a severe sadness.

He was an avid fan of cyclng, a hobby he picked up when he broke his drug addiction. When this bike developed artifact properties was unknown, but it is believed to have been a combination of Williams' desire to make others happy, often at the expense of his own health.

Effects
When ridden, the bike exudes a positive aura that improves the mood and outlook of those around it. People affected appear happier, more energetic and kinder in general. The rider, however, experinces opposite effects, becoming more morose, upset and downcast.

The effects can linger for days, but constant exposure can make the negative effects permanent.