I only heard a thingumabob and saw a what-you-may-call-it, I suppose?

Or the ludicrous giant laser sunbeam-type thingumabob?

I just don't understand how anyone can think it's interesting to see guys in gigantic padding chase around after a little black thingumabob.'

What's the name of that place?" "That's right," I answered, "just opposite Thingumabob.