I've been playing 4 and 5 string bass for a while now and have a big bass amp to run it through.

I've decided to relearn my guitar again, and the only guitar amp I have is a piddly little 15W amp, which sucks. I know running bass through a treble amp can damage it, but if I run my guitar through my bass amp, will it damage a bass amp? I'm assuming not but it did cost £300...so I want to make sure I'm right first.
Take a look to the sky just before you die...it's the last time you will...
You can run your guitar through your bassy amp but it may sound overly boomy and bassy.
My Gear :

Squier '51 (Dimarzio PAF Pro) (10-52s)
Roland Cube 15
Behringer X-V-Amp
Digitech Bad Monkey
BOSS DS-1 (modded)

Yamaha RBX270 (55-110s)
Behringer BXL900
EHX Bass Balls Pedal
EHX Big Muff Pi Pedal
yeah... it wont kill your speakers. just your sound will get... really dark and.... ugly sounding.....
music and soul of love and hope and light manifesting in our minds, trapping whats left of us in our hearts.
where theres nowhere to go.

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and this is a guy who's name is "i pwn"