I'll drink your Kool-Aid
You're saying you'll do whatever stupid thing your friend says, even if it means you'll end up in a ditch.
I'll drink your Kool-Aid. I've got nothing better to do.
I'll drink your Kool-Aid. I'm tired of being the smart one.
I'll drink your Kool-Aid. I'll probably vomit. But I'll do it anyway.