Among my biggest gripes about RVM (the Ruby enVironment Manager): that's the install method.
But SRSLY?!!!!!!!
How does RVM work? By throwing a shit-ton of hooks into your shell environment.
That shit right there made me put the brakes on and try to grok the hell out of what the tool did right there.
Upshot: it's useful and seems to do what it promises. Still bugs the crap out of me though.
The animated ASCII stuff? "nobody" account on a VM.