Prepending with another ASN you don't own

Is it acceptable to prepend using another networks ASN as long as your ASN is the last one in the path? I can think of a few scenarios where this is helpful. One scenario: Anycast content provider with an ISP (who you aren't directly peering with) is choosing to send all traffic to a PoP on another continent. Solution: Prepend at the geographically-distant PoP so that the AS path looks like <ACME> <BAD-ISP> <ACME>, and thus that service provider (<BAD-ISP>) views it as a routing loop and chooses one of your other PoPs. Sure there are better solutions like communities, but why (if it is) would this be "bad?" -- Andrew Imeson andrew@andrewimeson.com