Who knew a select could deadlock an insert

I guess I'm not the first to see this, mine looked like:

select
x.* 
from keytable k
  inner join bigtable x
    on k.akey = x.akey; 
---
insert into keytable
select distinct akey from #somewhere;

Each statement running in a different spid.

They are fighting over pages in the index of keytable. an indexed heap, fwiw.

Josh