I may be found on prison walls, where tallies track the days. Arrows usually have me, to prevent them flying astray. If you find a bedpost with me, I’d suggest you stay away!

It may be on the house But it is not free.

I fly up high with my little eye. For the sky, I am quite the reacher. But I can cause you to let out a sigh when I'm done by a boring teacher.

I'm a newfangled whosie whatsit like a thingy detector, If you're stumped, go go and ask a certain inspector.

I’m twins with bustle when streets are alive, A dance in the disco, a side where you strive. I’ll get you paid, or play you as a mark Push past the quiet, I thrive in the dark.