Okay I'm gonna sound like an idiot, but I thought the thumping sound was the hot water heater, but then when I realized what was going on I was like "Oh I get it now, derp a derp. 
You're purple emoticon is jumping around EXACTLY to the beat of"Scatman's World"
OMG Awesome 
Actually when I first made this I intended it to be the sound of ponies going up or down the stairs. But, then right as I posted it I realized everyone was going to give it a dirty interpretation. Seems a little funnier, so I went with it.
Yeah,I was probably the only one who thought it was the water heater.