Why does random crap always happen to me when no one else is around to see/hear it???

So I am in the bathroom here at work and someone else walks in (I assume) in mid conversation (with themselves or on the phone, couldn't tell but I didn't hear anyone else.) and I hear "If it wasn't for coffee I don't think I'd ever pooh." Ummmmmmmm....Okay, do you know how hard I had to work to stifle my laugh?? Then as I washed my hands and got the heck out of there I turned off the bathroom light (it's habit at home, I'm green yo.) and then had to switch it back on and get out of there before I lost it...I'm smooth.